scsi: core: Add VENDOR_SPECIFIC sense code definitions

Some older devices will return vendor specific sense codes, so we should
be adding a definition for it.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

include/scsi/scsi_proto.h

@@ -236,6 +236,7 @@ struct scsi_varlen_cdb_hdr {
 #define UNIT_ATTENTION      0x06
 #define DATA_PROTECT        0x07
 #define BLANK_CHECK         0x08
+#define VENDOR_SPECIFIC     0x09
 #define COPY_ABORTED        0x0a
 #define ABORTED_COMMAND     0x0b
 #define VOLUME_OVERFLOW     0x0d