backwards: Try to fix audio output

hosts/backwards/modules/boot/default.nix

@@ -38,6 +38,10 @@ in
 
         efi.canTouchEfiVariables = true;
       };
+
+      extraModprobeConfig = ''
+        options snd-intel-dspcfg dsp_driver=1
+      '';
     };
   };
 }