Cosim mismatch in some tests with PMP enabled using QuestaSim

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## Observed Behavior

I am getting the following error when running the tests using the default configuration (OpenTitan).
```
# UVM_FATAL ibex/dv/uvm/core_ibex/common/ibex_cosim_agent/ibex_cosim_scoreboard.sv(168) @ 50673967:
uvm_test_top.env.cosim_agent.scoreboard [uvm_test_top.env.cosim_agent.scoreboard] Cosim mismatch Synchronous trap was expected at ISS PC: ffffffff8000360a but the DUT didn't report one at PC 80003606
```
- riscv_debug_instr_test
- riscv_debug_wfi_test
- riscv_interrupt_wfi_test
- riscv_debug_single_step_test
- Other tests are matching the behavior in [Ibex Regression Results](https://ibex.reports.lowrisc.org/opentitan/latest/report.html)

## Expected Behavior

It was expected for these tests to pass with the default configuration as of here [Ibex Regression Results](https://ibex.reports.lowrisc.org/opentitan/latest/report.html)
When I set the PMPEnable to 0 in ibex configuration file it passes gracefully.

## Steps to reproduce the issue

- make SIMULATOR=questa ITERATIONS=1 TEST=riscv_debug_wfi_test

_The test passes when PMPEnable is set to 0 in [ibex_configs.yaml](https://github.com/lowRISC/ibex/blob/master/ibex_configs.yaml)_

## My Environment
**EDA tool and version:** Questasim 2023.1

**Operating system:** Linux-64 CentOS 7.9

**Version of the Ibex source code:** df88055aa38868451ce90d7fcc2bbf172a2dc8a0

Reproduce the mismatch with `make SIMULATOR=questa ITERATIONS=1 TEST=riscv_debug_wfi_test` and inspect `ibex/dv/uvm/core_ibex/common/ibex_cosim_agent/ibex_cosim_scoreboard.sv` around line 168. Compare the default configuration with `PMPEnable` set to 0 in `ibex_configs.yaml`; done means the listed tests pass with PMP enabled and match the regression results.

Written by the indexing model from the issue text.