scsi: ufs: Clear ucd_rsp_ptr for UPIU requests once

Previously, the response buffer (ucd_rsp_ptr) was cleared in multiple
UPIU preparation functions. Do it once.

Signed-off-by: Avri Altman <avri.altman@sandisk.com>
Link: https://lore.kernel.org/r/20250617095611.89229-2-avri.altman@sandisk.com


Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>