base-files: add protocol ncm support for ucidef_set_interface()

Make it possible to set up a default network (interface) for devices with
cellular modems using NCM.

Signed-off-by: Arınç ÜNAL <[email protected]>

package/base-files/files/bin/config_generate

@@ -208,6 +208,7 @@ generate_network() {
 			}
 		;;
 
+		ncm|\
 		qmi|\
 		mbim)
 			uci -q batch <<-EOF