scsi: ufs: Use get_unaligned_be16() instead of be16_to_cpup()

Use get_unaligned_be16(...) instead of the equivalent but harder to read
be16_to_cpup((__be16 *)...).

Link: https://lore.kernel.org/r/20220419225811.4127248-8-bvanassche@acm.org


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