mini-x_a10s: Add new fex file for A10s based mini-x mini top set box

Reported-by: Stefan Monnier <monnier@iro.umontreal.ca>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
mini-x_a10s: some small fixes

1) Update dram para to match a10-meminfo-static output
2) Change disp_mode to 0, as disp_mode 4 is not supported by linux-sunxi kernel

Signed-off-by: Hans de Goede <hdegoede@redhat.com>