SoC: device tree updates for 6.9

There is very little going on with new SoC support this time, all the
new chips are variations of others that we already support, and they
are all based on ARMv8 cores:

 - Mediatek MT7981B (Filogic 820) and MT7988A (Filogic 880) are
   networking SoCs designed to be used in wireless routers, similar
   to the already supported MT7986A (Filogic 830).

 - NXP i.MX8DXP is a variant of i.MX8QXP, with two CPU cores less.
   These are used in many embedded and industrial applications.

 - Renesas R8A779G2 (R-Car V4H ES2.0) and R8A779H0 (R-Car V4M)
   are automotive SoCs.

 - TI J722S is another automotive variant of its K3 family,
   related to the AM62 series.

There are a total of 7 new arm32 machines and 45 arm64 ones, including

 - Two Android phones based on the old Tegra30 chip

 - Two machines using Cortex-A53 SoCs from Allwinner, a mini PC and
   a SoM development board

 - A set-top box using Amlogic Meson G12A S905X2

 - Eight embedded board using NXP i.MX6/8/9

 - Three machines using Mediatek network router chips

 - Ten Chromebooks, all based on Mediatek MT8186

 - One development board based on Mediatek MT8395 (Genio 1200)

 - Seven tablets and phones based on Qualcomm SoCs, most of them
   from Samsung.

 - A third development board for Qualcomm SM8550 (Snapdragon 8 Gen 2)

 - Three variants of the "White Hawk" board for Renesas
   automotive SoCs

 - Ten Rockchips RK35xx based machines, including NAS, Tablet,
   Game console and industrial form factors.

 - Three evaluation boards for TI K3 based SoCs

The other changes are mainly the usual feature additions for existing hardware,
cleanups, and dtc compile time fixes. One notable change is the inclusion
of PowerVR SGX GPU nodes on TI SoCs.
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