coresight: cti: Remove CPU power management code

According Arm ARM, the CTI ASICCTL register:

  "It is IMPLEMENTATION DEFINED whether ASICCTL is implemented in the
   Core power domain or in the Debug power domain."

This is the only CTI register that may reside in the core power domain.
However, it has been confirmed that Arm designed CTIs place ASICCTL in
the debug power domain.  Furthermore, ASICCTL is implemented only when
CTIDEVID.EXTMUXNUM is non-zero, which is a rare case for CPU CTIs.

For these reasons, it is safe to conclude that all CTI registers are not
located in the CPU power domain. Therefore, the CTI driver does not need
CPU power management.

This commit removes the CPU power management from CTI driver.

Reviewed-by: Mike Leach <mike.leach@arm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260226-arm_coresight_cti_refactor_v1-v2-4-b30fada3cfec@arm.com

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