scsi: ufs: Improve type safety

Assign names to the enumeration types for UPIU types. Use these enumeration
types where appropriate.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230727194457.3152309-8-bvanassche@acm.org


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