Arm and RISC-V SoC fixes for 6.8, part 2

The Rockchip and IMX8 platforms get a number of fixes for dts files in
order to address some misconfigurations, including a regression for
USB-C support on some boards.

The other dts fixes are part of a series by Rob Herring to clean up
another class of dtc compiler warnings across all platforms, with
a few others helping out as well. With this, we can enable the warning
for the coming merge window without introducing regressions.

Conor Dooley has collected fixes for RISC-V platforms, both for the
dts files and for platofrm specific drivers.

The ep93xx platform gets a regression for for its gpio descriptors.
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