arm64: dts: allwinner: pinephone: add multicolor LED node

The red, green, and blue LEDs currently in the device tree represent a
single RGB LED on the front of the PinePhone.

Signed-off-by: Aren Moynihan <aren@peacevolution.org>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20240317004116.1473967-2-aren@peacevolution.org


Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>