Merge https://source.denx.de/u-boot/custodians/u-boot-sunxi

No big features this time, mostly a collection of patches that have been
lying around for a bit.  There are some DT updates, for those SoCs that
do not use OF_UPSTREAM yet, hopefully that's the last time we need to do
this exercise. And that's offset by switching over two more SoCs to
OF_UPSTREAM.  Two new boards get a defconfig, and some improvements for
the sun8i-emac Ethernet driver. Finally a patch that fixes occassional
DRAM size misdetection for new A523 boards.

There are a few outstanding patches that just wait for getting some
details confirmed, which I might send then later.

CI passed, and I tested this briefly on affected boards.