scsi: target: iblock: Remove an extra argument

scsi: target: iblock: Remove an extra argument

The two arguments to the functions op and opf which are REQ_OP_XXX and
REQ_XXX flags belong to the two different namespaces, i.e. they can be
combined safely given that REQ_OP_XXX takes 8 bits of the flags and rest is
available to REQ_XXX flags.

Replace op and op_flag arguments with opf.

Link: https://lore.kernel.org/r/20210228055645.22253-2-chaitanya.kulkarni@wdc.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>