exynos: common: enable generic fs operations

This config is required by Odroid, and could be also useful for the other
boards.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>

include/configs/exynos-common.h

@@ -75,6 +75,7 @@
 #define CONFIG_CMD_EXT4_WRITE
 #define CONFIG_CMD_FAT
 #define CONFIG_FAT_WRITE
+#define CONFIG_CMD_FS_GENERIC
 
 #define CONFIG_DOS_PARTITION
 #define CONFIG_EFI_PARTITION