bsa-acs : Update arm_bsa_testcase_checklist.md and create a test for B_PER_07, as it can be covered by B_PER_06 (606)

[sunnywang-arm]

Rule :

• RB_PER_07 The UART must be mapped onto Non-secure address space. This is called the Non-secure UART

Comment from @gowthamsiddarthd

• Since BSA ACS runs in Non-secure EL and test 606 accesses the UART registers and successfully validates interrupt behavior, it does demonstrate that:
  • The UART is accessible from Non-secure state, and
  • Interrupt generation/handling works via that Non-secure access
• Test 606 does not explicitly check the security attribution but it infers compliance through successful NS access and functionality.

[chetan-rathore]

Hi @sunnywang-arm,

Agree with the comments, B_PER_06 rule pass ensures B_PER_07 is also met. But B_PER_06 test fails might not mean B_PER_07 is not meeting non-compliance.

We will update the checklist to reflect the same and will track item to have a test to perform read/write on UART register addr space and cover the B_PER_07 test independently