Fixed private-timer timestamp issue in several ports (A5, A7, A9, R8) (#554)

* Fixed Cortex-A9 SMP time source

Updated Cortex-A9 SMP timestamp reads to use the global timer low counter instead of the decrementing private timer counter. Applied the change to GNU and AC5 ports.

* Fixed remaining Arm SMP time sources

Updated Cortex-A5, Cortex-A7, and Cortex-R8 SMP timestamp hooks so execution profiling uses incrementing time sources instead of the decrementing private timer count register.

Cortex-A5 and Cortex-R8 now read the global timer count low register, matching the Cortex-A9 fix. Cortex-A7 now reads the generic timer physical count register.

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Co-authored-by: Codex <[email protected]>

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