Merge branch 'master' of https://source.denx.de/u-boot/custodians/u-boot-sunxi

Merge branch 'master' of https://source.denx.de/u-boot/custodians/u-boot-sunxi

We have improvements to the reliability of H6 and H616 DRAM
initialisation, hopefully avoiding those occasional size misdetections
many people reported before.
Also there is some modernisation of the USB PHY code, to use DT provided
regulators and GPIOs, instead of relying on this being badly duplicated
in Kconfig. This also happens to fix broken USB operations for older
boards (using the A20 SoCs, for instance), which were clashing over
grabbing some GPIOs, leading to a driver bailout.  There is also some
rework of the H6/H616 SPL clock code, to prepare it for being reused by
the upcoming Allwinner A523 support. This drops the usage of C structs
to model MMIO register frames, and replaces them by using an addition of
the base address with a macro defined offset.  Also in preparation for
A523 there is one fix and one addition for the FEL code, to prepare for
the GICv3 interrupt controller that the new SoC uses. And since this is
a simple fix, and was ready, there is also the watchdog driver for that
new SoC. Finally tossing in an easy fix to some H616 defconfig files to
enable eMMC.

I also use the opportunity to enable proper page table protection
(observing read-only and no-execute attributes), support for which the
arm64 port recently gained. I didn't spot any issues on my arm64 board
tests, but it can be easily disabled or backed out again in case any
issues arise.

Full support for the two new SoC series (A133 and A523) we are working
on is not quite ready yet, but might follow still a bit later if
progress permits.

CI passed, and boot-tested on at least one board with a H616, H6, A64,
H3, A20, T113s.