libata: kill unused constants

Kill a few unused constants.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

include/linux/libata.h

@@ -111,13 +111,10 @@ enum {
 	/* various global constants */
 	LIBATA_MAX_PRD		= ATA_MAX_PRD / 2,
 	LIBATA_DUMB_MAX_PRD	= ATA_MAX_PRD / 4,	/* Worst case */
-	ATA_MAX_PORTS		= 8,
 	ATA_DEF_QUEUE		= 1,
 	/* tag ATA_MAX_QUEUE - 1 is reserved for internal commands */
 	ATA_MAX_QUEUE		= 32,
 	ATA_TAG_INTERNAL	= ATA_MAX_QUEUE - 1,
-	ATA_MAX_BUS		= 2,
-	ATA_DEF_BUSY_WAIT	= 10000,
 	ATA_SHORT_PAUSE		= (HZ >> 6) + 1,
 
 	ATAPI_MAX_DRAIN		= 16 << 10,