This adds initial support for the BPiR4.  It uses Frank-W's kernel as
large parts of mt7988a support has not made its way upstream yet.
Frank-W kernel's are very clean, so they're one of the fiew non-upstream
kernels this repo has the appitite to consume.

While the BananaPiR4's intended WiFi addon card will likely load up
without any extra work, it likely needs aditional work to not misbehave.

It is reported that FS resizing is problematic in a manner not caused by
the userspace resize code and that mtk_soc doesn't always load requiring
manual intervention with `rmmod mtk_eth && modprobe mtk_eth`.  As such
support of this SBC should be considered preliminary.

Comimt message edited by:
Sachi King <nakato@nakato.io>