Add ACS Test Coverage for RS_L5TI_01 (System Counter 1GHz Requirement)

[gowthamsiddarthd]

SBSA ACS currently does not implement a test for SBSA rule RS_L5TI_01, which mandates a 1 GHz effective system counter frequency for Level ≥5 systems.

Current Implementation Status

In test_pool/timer/t001.c:
B_TIME_02:

• Verifies minimum counter frequency (>10 MHz) as per BSA requirement
• Logs the counter frequency
• Does not validate the 1 GHz SBSA requirement

As clarified:
• The effective frequency must be 1 GHz regardless of FEAT_CNTSC scaling
• CNTFRQ_EL0 should be used to validate the effective (OS-visible) frequency
• CNTFID0 should be used to validate the minimum frequency (timer resolution)

Therefore:
• CNTFRQ_EL0 → Validate effective frequency (must be 1 GHz)
• CNTFID0 → Validate minimum frequency (BSA resolution requirement)

Proposed Changes

1. Add New ACS Test for RS_L5TI_01
   • Read CNTFRQ_EL0 from Non-secure world.
   • Fail if: CNTFRQ_EL0 != 1 GHz
2. Maintain Proper Separation of Responsibilities
   • B_TIME_02 → Continue validating minimum counter resolution (≥10 MHz) using CNTFID0.
   • New RS_L5TI_01 test → Validate 1 GHz effective frequency using CNTFRQ_EL0.