Merge branch 'main' of https://git.u-boot-project.org/u-boot/custodians/u-boot-sunxi

Beside a fix for a long standing bug in the A80 eMMC code, this adds
SPI booting support for the Allwinner A523/A527/T527 class of boards.
The second major feature is support for the secondary Ethernet controller
on that same SoC. This might not be as important as for the kernel (I
doubt that U-Boot acts as a router), but for once some boards only connect
the secondary EMAC, and on others people might have the boot server only
reachable via this port.
There are some smaller fixes and improvements still queued up, but they
need some more testing and are minor, so can land a bit later.

The world build timed out, but the rest passed, and I booted that briefly
on an A523 board with two Ethernet ports.