this patch consolidates the amd64-microcode
(moved to linux-firmware.git, previously this was an extra
debian source package download), amdgpu and radeon firmwares
into a shared "amd" makefile.
With the upcoming 20211216 linux-firmware bump,
this will include a microcode update for ZEN 3 CPUs.
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
