coresight: syscfg: Use IRQ-safe spinlock to protect active variables

cscfg_config_sysfs_get_active_cfg() will be used from idle flows, while
sleeping locks are not allowed.  Introduce sysfs_store_lock to replace
the mutex to protect sysfs_active_config and sysfs_active_preset
accesses, with IRQ-safe locking to avoid lockdep complaint.

Refactor cscfg_config_sysfs_activate() to use spinlock for
sysfs_active_config and activate/deactivate config.

Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: James Clark <james.clark@linaro.org>
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/20260515-arm_coresight_path_power_management_improvement-v14-14-f88c4a3ecfe9@arm.com

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