MMC: MXS: Toggle the generic bounce buffer on the boards

Flip the boards to use the generic bounce buffer instead of the
MMC one.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Andy Fleming <afleming@freescale.com>
Cc: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/include/configs/m28evk.h b/include/configs/m28evk.h
index bdbb820..b49ec8c 100644
--- a/include/configs/m28evk.h
+++ b/include/configs/m28evk.h
@@ -135,7 +135,7 @@
  */
 #ifdef	CONFIG_CMD_MMC
 #define	CONFIG_MMC
-#define	CONFIG_MMC_BOUNCE_BUFFER
+#define	CONFIG_BOUNCE_BUFFER
 #define	CONFIG_GENERIC_MMC
 #define	CONFIG_MXS_MMC
 #endif