Add common interface and timer data group functional tests

[rohitmadan07]

Description

This PR:-

1. Adds common interface for functional testing of granular locks. ( Implemented in the files granular_lock_utest_common.h and granular_lock_utest_common.c )
2. Adds functional tests for timer data group that utilises the above interface. ( granular_lock_timers_utest.c )
3. Updates task TCB structure for testing based on implementation change in Sudeep's kernel ( global_vars.h )
4. Fixes couple of SMP unit tests which were failing because of the updated TCB structure

Test Steps

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.

Related Issue

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