- only install it by default on x86, set new MKRADEONFIRMWARE variable
- install in /libdata, so that separate /usr systems work
(this still doesn't solve PR#49811, which possibly could be handled by
having them being a kernel module loaded by /boot.)
these were sourced from:
- linux kernel sources, firmware/radeon/
- people.freedesktop.org/~agd5f/radeon_ucode/
LICENSE.radeon has the full license, which my simple reading sees as
being largely similar to other re-distributable licenses for firmware
(ie, does not include de-compliation or reverse engineering.)