De-orbit Allwinner A10/A20/A31 for 12.0

[Mark Linimon]

On Wed, Jun 20, 2018 at 08:58:28AM -0600, Ian Lepore wrote:
> Wandboard, and most other things imx6-based, still work and are
> reasonably well-supported, and I'm even still actively writing new
> drivers for them as needed.

I did look through the u-boot ports yesterday and now see that they
were added in 2015 -- I would have guessed 2012 or something.  So I'm
wrong in this case.

mcl