sunxi: remove a20 olinuxino lime2

This hardware has only been announced, and there is a good possibility
that it will not have the exact same memory parameters upon release. It
will happily be re-added as and when it ships though.

Signed-off-by: Luc Verhaegen <libv@skynet.be>
sunxi: remove A13_MID

We have absolutely no idea what hardware this is supposed to be.

Signed-off-by: Luc Verhaegen <libv@skynet.be>
sunxi: fix up naming of some olimex devices

Signed-off-by: Luc Verhaegen <libv@skynet.be>
sunxi: fix up dram file name from 460 to 480

Typo and cut-n-paste...

Signed-off-by: Luc Verhaegen <libv@skynet.be>