facetimehd-firmware: deprecate phases

pkgs/os-specific/linux/firmware/facetimehd-firmware/default.nix

···
     curlOpts = "-r ${dmgRange}";
   };
 
-  phases = [ "buildPhase" ];
+  dontUnpack = true;
+  dontInstall = true;
 
   buildInputs = [ cpio xz ];