Add linux-rpi-kernel archives to lore.kernel.org?

[Bjorn Helgaas]

The linux-rpi-kernel@xxxxxxxxxxxxxxxxxxx mailing list is listed in
MAINTAINERS and is quite active [1].  Once in a while a commit links
to the infradead pipermail archive [2] (the link in that commit
appears broken).

I propose that we add linux-rpi-kernel to the lore.kernel.org archives
so future commits can use lore.kernel.org links that don't depend on
infradead.

https://korg.docs.kernel.org/lore.html says pipermail archives like
infradead has are not ideal, but I don't have any archives at all, and
I don't know how to get even pipermail archives out of infradead.

Bjorn

[1] https://lists.infradead.org/pipermail/linux-rpi-kernel/
[2] https://git.kernel.org/linus/f147384774a7