Revert "scsi: core: Introduce scsi_get_sector()"

This reverts commit f230e6d which is
commit f0f214f upstream.

As reported, a lot of scsi changes were made just to resolve a 2 line
patch, so let's revert them all and then manually fix up the 2 line
fixup so that things are simpler and potential abi changes are not an
issue.

Link: https://lore.kernel.org/r/ZZ042FejzwMM5vDW@duo.ucw.cz
Reported-by: Pavel Machek <pavel@ucw.cz>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Damien Le Moal <damien.lemoal@wdc.com>
Cc: Benjamin Block <bblock@linux.ibm.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/scsi/scsi_cmnd.h

@@ -224,11 +224,6 @@ static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
 				 buf, buflen);
 }
 
-static inline sector_t scsi_get_sector(struct scsi_cmnd *scmd)
-{
-	return blk_rq_pos(scmd->request);
-}
-
 /*
  * The operations below are hints that tell the controller driver how
  * to handle I/Os with DIF or similar types of protection information.