embestmx6boards: convert to generic board

Enable CONFIG_SYS_GENERIC_BOARD to remove warning on boot.

Signed-off-by: Iain Paton <ipaton0@gmail.com>
diff --git a/include/configs/embestmx6boards.h b/include/configs/embestmx6boards.h
index f1000f3..a7fd43b 100644
--- a/include/configs/embestmx6boards.h
+++ b/include/configs/embestmx6boards.h
@@ -19,6 +19,8 @@
 #include "mx6_common.h"
 #include <linux/sizes.h>
 
+#define CONFIG_SYS_GENERIC_BOARD
+
 #define CONFIG_MXC_UART_BASE		UART2_BASE
 #define CONFIG_CONSOLE_DEV		"ttymxc1"
 #define CONFIG_MMCROOT			"/dev/mmcblk1p2"