ARM: vf610m4: defconfig: enable EXT4 filesystem

Enable EXT4_FS to have rootfs in EXT[2-4].

Other changes are result of savedefconfig keeping minimal config (even
without enabling EXT4_FS, these would be present).

Signed-off-by: afzal mohammed <afzal.mohd.ma@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>