[U-Boot] sunxi: Initial A80 support

[Hans de Goede]

Hi Ian, ChenYu,

I'm very happy to present this patch series which adds initial A80 support,
with this series a u-boot.bin can be build which can then be fel booted
using Allwinners boot0 fel binary, and then can load linux from a sdcard
using a standard extlinux.conf setup.

Next step getting RSB going and finding out how the 2 pmics are hooked up,
and then slowly work towards getting SPL going.

Ian, as always, can you please review these patches ?

ChenYu, if you want to play with this, it is probably easiest to use my
sunxi-wip branch.

Regards,

Hans