scsi: ufs: core: Convert UPIU_HEADER_DWORD() into a function

This change reduces the number of parentheses that are required in the
definition of this function and also when using this function.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230706215054.4113469-1-bvanassche@acm.org


Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>