sunxi: Add default zq value for sun9i (A80)

Both the A80 Optimus board and the Cubieboard 4 use a zq value of
4145117, or 0x3f3fdd.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>