genhd: remove dead and duplicated scsi code

blk_scsi_cmd_filter use was deprecated by 4beab5c6 and the SCSI macros
are duplicated in blkdev.h, both likely reintroduced by a bad merge from
540eed56.

Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

include/linux/genhd.h

@@ -146,15 +146,6 @@ enum {
 	DISK_EVENT_EJECT_REQUEST		= 1 << 1, /* eject requested */
 };
 
-#define BLK_SCSI_MAX_CMDS	(256)
-#define BLK_SCSI_CMD_PER_LONG	(BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
-
-struct blk_scsi_cmd_filter {
-	unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
-	unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
-	struct kobject kobj;
-};
-
 struct disk_part_tbl {
 	struct rcu_head rcu_head;
 	int len;