[CW340] Setup issues with new CW340 board

### Description

I have followed the [setup](https://opentitan.org/book/doc/getting_started/setup_fpga.html#cw340-board) process for a new CW340 card, however am unable to get any of the bazel tests to dispatch to the board.

Communication to the board appears to be working correctly:
```
./bazelisk.sh run //sw/host/opentitantool -- fpga set-pll
INFO: Analyzed target //sw/host/opentitantool:opentitantool (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
INFO: Elapsed time: 0.277s, Critical Path: 0.02s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action
INFO: Running command line: bazel-bin/sw/host/opentitantool/opentitantool fpga set-pll
```

and I can program the FPGA:
```
./bazelisk.sh run //sw/host/opentitantool -- fpga load-bitstream /tmp/bitstream-latest/chip_earlgrey_cw340/lowrisc_syst
ems_chip_earlgrey_cw340_0.1.bit
INFO: Analyzed target //sw/host/opentitantool:opentitantool (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
INFO: Elapsed time: 0.202s, Critical Path: 0.01s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action
INFO: Running command line: bazel-bin/sw/host/opentitantool/opentitantool fpga load-bitstream /tmp/bitstream-latest/chip_earlgrey_cw340/lowrisc_systems_chip_earlgrey_cw340_0.1.bit
[00:00:21] [██████████████████████████████████████] 34.18 MiB/34.18 MiB (0s)
```

which gives the expected boot-time console printing with `screen /dev/ttyUSB2 115200,cs8,-ixon,-ixoff`:
```
I00001 test_rom.c:158] kChipInfo: scm_revision=54697461
I00002 test_rom.c:184] TestROM:f2313587
I00003 test_rom.c:230] Test ROM complete, jumping to flash (addr: 20000000)!
```

However, trying to dispatch a test gives an `Error: Found no USB device`:
```
./bazelisk.sh test --test_output=streamed /
/sw/device/tests:uart_smoketest_fpga_${BOARD}_rom_with_fake_keys
WARNING: Streamed test output requested. All tests will be run locally, without sharding, one at a time
DEBUG: /home/admin-sqai/opentitan/rules/autogen.bzl:151:14: NOTE: stamping is disabled, the chip_info section will use a fixed version string
DEBUG: /home/admin-sqai/opentitan/rules/autogen.bzl:151:14: NOTE: stamping is disabled, the chip_info section will use a fixed version string
INFO: Analyzed target //sw/device/tests:uart_smoketest_fpga_cw340_rom_with_fake_keys (43 packages loaded, 11718 targets configured).
INFO: Found 1 test target...
Invoking test: sw/host/opentitantool/opentitantool --rcfile= --logging=info --interface=hyper340 --exec=transport init --exec=fpga load-bitstream hw/bitstream/universal/splice.bit --exec=bootstrap --clear-uart=true sw/device/tests/uart_smoketest_fpga_cw340_rom_with_fake_keys.test_key_0.signed.bin --exec=console --non-interactive --exit-success='PASS.*\n' --exit-failure='((FAIL|FAULT).*\n)|(BFV:[0-9a-f]{8})' no-op
Error: Found no USB device

Stack backtrace:
0: >::into
1: anyhow::kind::Trait::new
2: opentitanlib::util::usb::UsbBackend::new
3: opentitanlib::transport::hyperdebug::Hyperdebug::open
4: opentitanlib::backend::hyperdebug::create
5: opentitanlib::backend::create
6: opentitantool::main
7: core::ops::function::FnOnce::call_once
8: std::sys_common::backtrace::__rust_begin_short_backtrace
9: std::rt::lang_start::{{closure}}
10: core::ops::function::impls:: for &F>::call_once
at /rustc/32303b219d4dffa447aa606bc11c7a648f44a862/library/core/src/ops/function.rs:284:13
std::panicking::try::do_call
at /rustc/32303b219d4dffa447aa606bc11c7a648f44a862/library/std/src/panicking.rs:524:40
std::panicking::try
at /rustc/32303b219d4dffa447aa606bc11c7a648f44a862/library/std/src/panicking.rs:488:19
std::panic::catch_unwind
at /rustc/32303b219d4dffa447aa606bc11c7a648f44a862/library/std/src/panic.rs:142:14
std::rt::lang_start_internal::{{closure}}
at /rustc/32303b219d4dffa447aa606bc11c7a648f44a862/library/std/src/rt.rs:148:48
std::panicking::try::do_call
at /rustc/32303b219d4dffa447aa606bc11c7a648f44a862/library/std/src/panicking.rs:524:40
std::panicking::try
at /rustc/32303b219d4dffa447aa606bc11c7a648f44a862/library/std/src/panicking.rs:488:19
std::panic::catch_unwind
at /rustc/32303b219d4dffa447aa606bc11c7a648f44a862/library/std/src/panic.rs:142:14
std::rt::lang_start_internal
at /rustc/32303b219d4dffa447aa606bc11c7a648f44a862/library/std/src/rt.rs:148:20
11: std::rt::lang_start
12: main
13: __libc_start_call_main
at ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
14: __libc_start_main_impl
at ./csu/../csu/libc-start.c:392:3
15: _start
cleanup:
FAIL: //sw/device/tests:uart_smoketest_fpga_cw340_rom_with_fake_keys (see /home/admin-sqai/.cache/bazel/_bazel_admin-sqai/a9589ee45fb4114764ac879aea12063a/execroot/lowrisc_opentitan/bazel-out/k8-fastbuild-ST-2cc462681f62/testlogs/sw/device/tests/uart_smoketest_fpga_cw340_rom_with_fake_keys/test.log)
INFO: Elapsed time: 5.298s, Critical Path: 1.15s
INFO: 2 processes: 2 local.
INFO: Build completed, 1 test FAILED, 2 total actions
//sw/device/tests:uart_smoketest_fpga_cw340_rom_with_fake_keys FAILED in 0.6s
/home/admin-sqai/.cache/bazel/_bazel_admin-sqai/a9589ee45fb4114764ac879aea12063a/execroot/lowrisc_opentitan/bazel-out/k8-fastbuild-ST-2cc462681f62/testlogs/sw/device/tests/uart_smoketest_fpga_cw340_rom_with_fake_keys/test.log

Executed 1 out of 1 test: 1 fails locally.
```

Is there a step missing in the setup guide? Is there supposed to be more than the one USB connection to J28?

Thanks,
Andy