scsi: ufs: core: Move ufshcd_wl_shutdown()

Move the definition of ufshcd_wl_shutdown() to make the next patch in this
series easier to review.

Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230524203659.1394307-4-bvanassche@acm.org


Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>