[fedora-arm] Rockchip rk35xx support

Hey Folks,

So we've had issues with officially supporting a number of different
platforms in Fedora directly and for a while I have been pondering how
we can better enable these platforms to work better on Fedora. This
isn't limited to rk35xx by any means, it's merely the first platforms
I took the time to look at.

What I've come up with is a copr repo with builds for those platforms
that are very similar to the experience you get from the official
Fedora builds. I am still working out the best way to integrate this
with arm-image-iinstaller to make the experience as straight forward
as possible.

To try it you can do:
dnf copr enable pbrobinson/u-boot; dnf install uboot-images-copr

So with this first round it should work with 22 rk3588 based boards.
I've actively tested the Rock5B (both mmc/SPI). To write a mSD card
you can use the dd command below, for SPI the process is basically the
same as the Pinebook Pro [1].

sudo dd if=/usr/share/uboot/rock5b-rk3588/u-boot-rockchip.bin
of=/dev/XXX seek=64

There are rk356x builds as well but they currently have an issue and
while you get the early firmware and initial Fedora the boot doesn't
complete. I am working to fix this problem with the vendor. So at the
moment they shouldn't be used.

I look forward to hearing feedback and suggestions for improvement.
I'm looking to add some TI devices as well, from there we'll see where
this goes.

Regards,
Peter

[1] https://nullr0ute.com/2021/05/fedora-on-the-pinebook-pro/
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