sunxi: Add support for the Forfun Q88DB tablet

The Forfun Q88DB is an A13 tablet in the common Q8 format.

Features are 512MB RAM, 4GB NAND, 7" Display, RTL8188 Wifi, 2 cameras.

For more details see: http://linux-sunxi.org/Forfun_Q88DB



Signed-off-by: Jens Lucius <info@jenslucius.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Ian Campbell <ijc@hellion.org.uk>