mmc: Remove incorrect cmd->flags usage

There were a couple of drivers that were actually using the flags
field of the cmd structure, despite the fact that no one ever
*set* that field. When we removed the field, those drivers failed
to compile. Replaced the references with the correct usage of
resp_type.

Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/drivers/mmc/arm_pl180_mmci.c b/drivers/mmc/arm_pl180_mmci.c
index db2c7ab..af1380a 100644
--- a/drivers/mmc/arm_pl180_mmci.c
+++ b/drivers/mmc/arm_pl180_mmci.c
@@ -52,7 +52,7 @@
 		debug("CMD%d time out\n", cmd->cmdidx);
 		return TIMEOUT;
 	} else if ((hoststatus & SDI_STA_CCRCFAIL) &&
-		   (cmd->flags & MMC_RSP_CRC)) {
+		   (cmd->resp_type & MMC_RSP_CRC)) {
 		printf("CMD%d CRC error\n", cmd->cmdidx);
 		return -EILSEQ;
 	}