fix(linux-firmware): dont package amd-ucode

pkgs/linux-firmware/post-install.sh

@@ -25,11 +25,12 @@ EOF
   rm -rf $out/$p
 }
 
+# split into systemd sysext packages
 fwdir=$out/usr/lib/firmware
 
-# split into packages
-_pick linux-firmware-amd-ucode "${fwdir}"/amd-ucode
-_package linux-firmware-amd-ucode
+# we don't care about amd-ucode (we use nixpkg amd-ucode instead)
+_pick amd-ucode "${fwdir}"/amd-ucode
+rm -rf $out/amd-ucode
 
 _pick linux-firmware-amdgpu "${fwdir}"/amdgpu
 _package linux-firmware-amdgpu
@@ -76,6 +77,7 @@ _package linux-firmware-radeon
 _pick linux-firmware-realtek "${fwdir}"/{realtek,rtlwifi,rtw8*,rtl_*}
 _package linux-firmware-realtek
 
+# The rest will be packaged as 'other'
 _pick linux-firmware-other "${fwdir}"
 _package linux-firmware-other