sunxi: Add mk802ii board / defconfig

The mk802ii is a revised version of the mk802 A10 based hdmi tv-stick, it
features 1G RAM, 4G nand, a hdmi male connector, USB-A receptacle, 2 micro
usb receptacles (OTG & power) and USB-wifi, and does come with an axp209 pmic.

For more details see: http://linux-sunxi.org/Rikomagic_mk802ii



Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>