MediaTek ARM64 DeviceTree updates for v6.9

This adds support for the following new machines:
 - MT7981B: Xiaomi AX3000T
 - MT7986A: Acelink EW-7886CAX
 - MT7988A: BananaPi BPI-R4
 - MT8186 Chromebooks: Tentacruel, Tentacool, Steelix, Rusty, Magneton
 - MT8395/MT8195: Radxa NIO 12L

Also adds more support for the MediaTek MT8186 SoC's Video and JPEG
encoders and for MT7988 clocks, enables wakeup support for the CrOS
EC on SPI in all MediaTek Chromebooks, performs some cleanups and
includes some spare fixes.
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