[libata] remove two unused fields from struct ata_port

include/linux/libata.h

@@ -330,8 +330,6 @@ struct ata_port {
 
 	u8			ctl;	/* cache of ATA control register */
 	u8			last_ctl;	/* Cache last written value */
-	unsigned int		bus_state;
-	unsigned int		port_state;
 	unsigned int		pio_mask;
 	unsigned int		mwdma_mask;
 	unsigned int		udma_mask;