sunxi: rework target
 - update kernel to 3.12
 - add patches for clocks, i2c, usb, sid, rtc
 - support common image for A10/A13/A20
 - add support for a couple boards
 - most drivers are configured into the kernel as of now

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>



git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38811 3c298f89-4303-0410-b956-a3cf2f4a3e73