coresight: etm4x: don't include '<linux/pm_wakeup.h>' directly

The header clearly states that it does not want to be included directly,
only via '<linux/(platform_)?device.h>'. Which is already present, so
delete the superfluous include.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250210113635.51935-2-wsa+renesas@sang-engineering.com