ADA_ITSYBITSY_M0: extmod_hardware_machine_pwm.py

# Bug Report

## Environment
-  testbed_micropython version: 2025-07-31

## Description

https://reports.octoprobe.org/github_selfhosted_testrun_206/RUN-TESTS_EXTMOD_HARDWARE_NATIVE,a@5f2a-ADA_ITSYBITSY_M0/extmod_hardware_machine_pwm.py.out

```
Traceback (most recent call last):
  File "<stdin>", line 36, in <module>
MemoryError: memory allocation failed, allocating 324 bytes
CRASH
```