ARM: SoC changes for 5.14

A few SoC (code) changes have queued up this cycle, mostly for minor
changes and some refactoring and cleanup of legacy platforms. This
branch also contains a few of the fixes that weren't sent in by the end
of the release (all fairly minor).

 - Adding an additional maintainer for the TEE subsystem (Sumit Garg)

 - Quite a significant modernization of the IXP4xx platforms by Linus
   Walleij, revisiting with a new PCI host driver/binding, removing legacy
   mach/* include dependencies and moving platform detection/config to
   drivers/soc. Also some updates/cleanup of platform data.

 - Core power domain support for Tegra platforms, and some improvements
   in build test coverage by adding stubs for compile test targets.

 - A handful of updates to i.MX platforms, adding legacy (non-PSCI) SMP
   support on i.MX7D, SoC ID setup for i.MX50, removal of platform data
   and board fixups for iMX6/7.

 ... and a few smaller changes and fixes for Samsung, OMAP, Allwinner,
 Rockchip.