sw/device/silicon_creator/rom/e2e/boot_policy_bad_manifest_too_small_b_img_sim_verilator errors out in verilator

```[2023-05-12T08:54:48Z INFO opentitanlib::transport::verilator::subprocess::stdout] %Warning: System has 2 CPUs but model Verilated with --threads 4; may run slow.
[2023-05-12T08:54:48Z INFO opentitanlib::transport::verilator::subprocess::stdout] Simulation of OpenTitan Earl Grey
[2023-05-12T08:54:48Z INFO opentitanlib::transport::verilator::subprocess::stdout]
[2023-05-12T08:54:48Z INFO opentitanlib::transport::verilator::subprocess::stdout] =================================
[2023-05-12T08:54:48Z INFO opentitanlib::transport::verilator::subprocess::stdout]
[2023-05-12T08:54:48Z INFO opentitanlib::transport::verilator::subprocess::stdout]
[2023-05-12T08:54:48Z INFO opentitanlib::transport::verilator::subprocess::stdout]
[2023-05-12T08:54:48Z INFO opentitanlib::transport::verilator::subprocess::stdout] %Error: sw/device/silicon_creator/rom/e2e/boot_policy_bad_manifest_too_small_b_img_sim_verilator.signed.64.scr.vmem:16384: $readmem file address beyond bounds of array
[2023-05-12T08:54:48Z INFO opentitanlib::transport::verilator::subprocess::stdout]
[2023-05-12T08:54:48Z INFO opentitanlib::transport::verilator::subprocess::stdout] Aborting...
[2023-05-12T08:54:48Z INFO opentitanlib::transport::verilator::subprocess::stdout]
Error: Timed out

Stack backtrace:
0: anyhow::error::<impl anyhow::Error>::msg
1: anyhow::__private::format_err
2: opentitanlib::transport::verilator::subprocess::Subprocess::find
3: opentitanlib::transport::verilator::transport::Verilator::from_options
4: opentitanlib::backend::verilator::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::<impl core::ops::function::FnOnce<A> for &F>::call_once
at /rustc/c18a5e8a5b1afb0d7a582fe9ebad4c1996c90da3/library/core/src/ops/function.rs:287:13
11: std::panicking::try::do_call
at /rustc/c18a5e8a5b1afb0d7a582fe9ebad4c1996c90da3/library/std/src/panicking.rs:483:40
12: std::panicking::try
at /rustc/c18a5e8a5b1afb0d7a582fe9ebad4c1996c90da3/library/std/src/panicking.rs:447:19
13: std::panic::catch_unwind
at /rustc/c18a5e8a5b1afb0d7a582fe9ebad4c1996c90da3/library/std/src/panic.rs:140:14
14: std::rt::lang_start_internal::{{closure}}
at /rustc/c18a5e8a5b1afb0d7a582fe9ebad4c1996c90da3/library/std/src/rt.rs:148:48
15: std::panicking::try::do_call
at /rustc/c18a5e8a5b1afb0d7a582fe9ebad4c1996c90da3/library/std/src/panicking.rs:483:40
16: std::panicking::try
at /rustc/c18a5e8a5b1afb0d7a582fe9ebad4c1996c90da3/library/std/src/panicking.rs:447:19
17: std::panic::catch_unwind
at /rustc/c18a5e8a5b1afb0d7a582fe9ebad4c1996c90da3/library/std/src/panic.rs:140:14
18: std::rt::lang_start_internal
at /rustc/c18a5e8a5b1afb0d7a582fe9ebad4c1996c90da3/library/std/src/rt.rs:148:20
19: std::rt::lang_start
20: main
21: __libc_start_main
22: <unknown>```

[Slack Message](https://opentitan.slack.com/archives/D054V4YQ495/p1684052124225599)

Start with sw/device/silicon_creator/rom/e2e/boot_policy_bad_manifest_too_small_b_img_sim_verilator and the generated .signed.64.scr.vmem file, then reproduce the Verilator run. Investigate the $readmem bounds error at address 16384; done means this e2e test completes without aborting or timing out.

Written by the indexing model from the issue text.