Replace CONFIG_MMC_BOUNCE_BUFFER with CONFIG_BOUNCE_BUFFER in configs

Commits 6dc71c8 "MMC: MXS: Toggle the generic bounce buffer on the
boards" and 49a627f "MMC: Remove the MMC bounce buffer" replaced
CONFIG_MMC_BOUNCE_BUFFER with CONFIG_BOUNCE_BUFFER, but missed
converting a few boards over to the new option. Fix this.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/include/configs/mx6qarm2.h b/include/configs/mx6qarm2.h
index 23562a8..28a3deb 100644
--- a/include/configs/mx6qarm2.h
+++ b/include/configs/mx6qarm2.h
@@ -50,7 +50,7 @@
 #define CONFIG_MMC
 #define CONFIG_CMD_MMC
 #define CONFIG_GENERIC_MMC
-#define CONFIG_MMC_BOUNCE_BUFFER
+#define CONFIG_BOUNCE_BUFFER
 #define CONFIG_CMD_FAT
 #define CONFIG_DOS_PARTITION