Update portSTACK_REGION in Cortex-M3 and M4 ports

[kar-rahul-aws]

Description

This PR updates MPU Region number used for task stack region so that MPU region numbers programmed on every context switch are continuous.

Test Steps

Run Soak tests on STM32NUCLEO_H743ZI2

Checklist:

• I have tested my changes. No regression in existing tests.
• I have modified and/or added unit-tests to cover the code changes in this Pull Request.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (2cdd0e5) 94.43% compared to head (6f92053) 94.43%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #713   +/-   ##
=======================================
  Coverage   94.43%   94.43%           
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  Files           6        6           
  Lines        2428     2428           
  Branches      596      596           
=======================================
  Hits         2293     2293           
  Misses         85       85           
  Partials       50       50           

Flag	Coverage Δ
unittests	94.43% <ø> (ø)

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