Add BOOT LED support for Cubieboard2

[Alexander Dahl]

Hello Javad,

Am Mon, Dec 06, 2021 at 09:53:22PM +0330 schrieb Javad Rahimi:
> I'm still waiting for my email approval, Is something wrong with my message?
> 
> Hello,
> I added LED boot support for my SUN7I based Cubieboard2. I want to send a
> patch for the changes. It is my first contribution and as It has been
> mentioned in the `Patches` pages, I'm asking you before for confirmation
> sending the patch.

I'm not sure which patches pages you are talking about, but it's
usually okay to just send the patch.

Greets
Alex