linux-firmware: Install microcode for AMD processors

> This package contains microcode patches for all AMD AMD64
> processors.  AMD releases microcode patches to correct
> processor behavior as documented in the respective processor
> revision guides.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/amd-ucode

linux-firmware.be0

@@ -70,6 +70,7 @@ SRCURL[0]="/src/mariux/beeroot/downloads/linux-firmware-0_${PKGEXTRAVERSION}.tar
 mee_install() {
   mkdir -p $D/lib/firmware
   cp -ax ${S}/amdgpu $D/lib/firmware
+  cp -ax ${S}/amd-ucode $D/lib/firmware
   cp -ax ${S}/bnx2  $D/lib/firmware
   cp -ax ${S}/bnx2x $D/lib/firmware
   cp -ax ${S}/i915  $D/lib/firmware