coresight/etm4: fix missing disable active config

When etm4 device is disabled via sysfs, it should disable its active
count.

Fixes: 7ebd0ec6 ("coresight: configfs: Allow configfs to activate configuration")
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250514161951.3427590-2-yeoreum.yun@arm.com