arm64: dts: rockchip: Update leds for Anbernic RGxx3 Series

Each of the LEDs on the RGxx3 which is currently controlled via GPIO
can also be controlled via a PWM. Change each of the LEDs to PWM so
that users have the ability to adjust the brightness of the LEDs
according to their preference.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Link: https://lore.kernel.org/r/20230512191633.33416-1-macroalpha82@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>