sunxi: Add default MMC0 card detect pin for A83T, H3 and A64 SoCs

A83T, H3, and A64 have a dedicated pin for card detect on the PF
pingroup. This is used in all designs. Set it as the default.

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