Reset controller updates for v6.9

Enable support for the Sophgo SG2042 reset controller via reset-simple,
add a GPIO-based reset controller criver for shared GPIO resets, extract
an of_phandle_args_equal() helper function out of cpufreq, and use it in
reset-gpio.

Based on v6.8-rc5 because reset-gpio depends on commits in the
gpio-driver-h-stubs-for-v6.8-rc5 tag.
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