ARM: mxs_defconfig: Add VFAT support

Select CONFIG_VFAT_FS by default.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/configs/mxs_defconfig

@@ -149,6 +149,7 @@ CONFIG_EXT4_FS=y
 CONFIG_FSCACHE=m
 CONFIG_FSCACHE_STATS=y
 CONFIG_CACHEFILES=m
+CONFIG_VFAT_FS=y
 CONFIG_TMPFS=y
 CONFIG_TMPFS_POSIX_ACL=y
 CONFIG_JFFS2_FS=y