[PATCH] PinePhone: enable LED on boot for improved visual feedback

[Arnaud Ferraris]

Hi,

As the PinePhone doesn't provide any visual feedback when booting, these
patches take advantage of the built-in RGB LED to indicate the device
is indeed powered on.

I've been carrying those downstream in Mobian for some time now,
allowing users to see their phone is booting (otherwise it can be
several seconds before the kernel is loaded and able to show a sign of
life).

Best regards,
Arnaud