coresight: cti: Remove hw_powered flag

coresight: cti: Remove hw_powered flag

Since the CPU PM code has been removed from the CTI driver and the device
is enabled via runtime PM, pm_runtime_active() can be used to check
whether the device is powered.

As a result, the hw_powered flag is redundant, remove it.

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-v2-6-b30fada3cfec@arm.com