mmc: remove unused "ddr" parameter in struct mmc_ios

"mmc: dw_mmc: Fix DDR mode support" removed the last user.
Signed-off-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NChris Ball <cjb@laptop.org>

include/linux/mmc/host.h

@@ -56,8 +56,6 @@ struct mmc_ios {
 #define MMC_TIMING_UHS_SDR104	4
 #define MMC_TIMING_UHS_DDR50	5
 
-	unsigned char	ddr;			/* dual data rate used */
-
 #define MMC_SDR_MODE		0
 #define MMC_1_2V_DDR_MODE	1
 #define MMC_1_8V_DDR_MODE	2