Update code to work with demos using latest mbedtls version

[DakshitBabbar]

Description

This PR updates the code to work with P3 demos using the latest MbedTLS v3.6.3.

The new version of MbedTLS introduces some new mutexes that it uses for threading. This PR updates the code to initialise those mutexes.

Test Steps

The P3 Demos using corePKCS and mbedtls are all working well.

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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.79%. Comparing base (e0cd4db) to head (5dbdb5b).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #207      +/-   ##
==========================================
+ Coverage   94.02%   96.79%   +2.76%     
==========================================
  Files           3        3              
  Lines        1690     1745      +55     
  Branches      442      457      +15     
==========================================
+ Hits         1589     1689     +100     
+ Misses         17        0      -17     
+ Partials       84       56      -28     

Flag	Coverage Δ
unit_tests	96.79% <ø> (+2.76%)	⬆️

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