[libata] remove synchronize-cache dead code

Just a placeholder, and now that a better way to do this is coming,
we don't even need the [unused] placeholder anymore.

drivers/scsi/libata-scsi.c

@@ -619,30 +619,6 @@ unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
 	return 0;
 }
 
-/**
- *	ata_scsiop_sync_cache - Simulate SYNCHRONIZE CACHE command
- *	@args: Port / device / SCSI command of interest.
- *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
- *	@buflen: Response buffer length.
- *
- *	Initiates flush of device's cache.
- *
- *	TODO:
- *	Actually do this :)
- *
- *	LOCKING:
- *	spin_lock_irqsave(host_set lock)
- */
-
-unsigned int ata_scsiop_sync_cache(struct ata_scsi_args *args, u8 *rbuf,
-				  unsigned int buflen)
-{
-	VPRINTK("ENTER\n");
-
-	/* FIXME */
-	return 1;
-}
-
 /**
  *	ata_msense_push - Push data onto MODE SENSE data output buffer
  *	@ptr_io: (input/output) Location to store more output data
@@ -1192,13 +1168,6 @@ static void ata_scsi_simulate(struct ata_port *ap, struct ata_device *dev,
 			ata_bad_cdb(cmd, done);
 			break;
 
-		case SYNCHRONIZE_CACHE:
-			if ((dev->flags & ATA_DFLAG_WCACHE) == 0)
-				ata_bad_scsiop(cmd, done);
-			else
-				ata_scsi_rbuf_fill(&args, ata_scsiop_sync_cache);
-			break;
-
 		case READ_CAPACITY:
 			ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
 			break;