rtw89: prepend kernel.makeFlags to makeFlags, pass moduleBuildDependencies

pkgs/os-specific/linux/rtw89/default.nix

···
     sha256 = "0cvawyi1ksw9xkr8pzwipsl7b8hnmrb17w5cblyicwih8fqaw632";
   };
 
-  makeFlags = [ "KSRC=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build" ];
+  nativeBuildInputs = kernel.moduleBuildDependencies;
+  makeFlags = kernel.makeFlags ++ [ "KSRC=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build" ];
 
   enableParallelBuilding = true;