Enable Star-MC3 for AC6 and GCC via Cortex-M52 compatibility

[JonatanAntoni]

Neither AC6 nor GCC have native support for ArmChina's Star-MC3 core. But as MC3 is very close to Cortex-M52 we should be fine falling back to M52.

[JonatanAntoni]

@AlbertHuang-CPU to confirm

[github-actions]

Test Results

  7 files   53 suites   6m 28s ⏱️
185 tests 168 ✅ 17 💤 0 ❌
692 runs  624 ✅ 68 💤 0 ❌

Results for commit 77f5f03.

[AlbertHuang-CPU]

@AlbertHuang-CPU to confirm

Yes. The changes LGTM.

[brondani]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.43%. Comparing base (fdf6511) to head (77f5f03).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2340   +/-   ##
=======================================
  Coverage   64.43%   64.43%           
=======================================
  Files         145      145           
  Lines       25997    25997           
  Branches    15666    15666           
=======================================
  Hits        16750    16750           
+ Misses       7083     7080    -3     
- Partials     2164     2167    +3     

Flag	Coverage Δ
buildmgr-cov	79.87% <ø> (ø)

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