a70x: Add a20 a70x tablet fex file

Reported-by: tuksgig@gmail.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
a70x: Fill in dram parameters from a10-meminfo

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Marsboard_A10: add Marsboard_A10 fex file

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