dbus: Remove duplicate signal declaration

ServiceDiscoveryExternal is uselessly declared twice.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>

wpa_supplicant/dbus/dbus_new.c

@@ -2679,13 +2679,6 @@ static const struct wpa_dbus_method_desc wpas_dbus_interface_methods[] = {
 		  END_ARGS
 	  }
 	},
-	{ "ServiceDiscoveryExternal", WPAS_DBUS_NEW_IFACE_P2PDEVICE,
-	  (WPADBusMethodHandler)wpas_dbus_handler_p2p_serv_disc_external,
-	  {
-		  { "arg", "i", ARG_IN },
-		  END_ARGS
-	  }
-	},
 	{ "AddPersistentGroup", WPAS_DBUS_NEW_IFACE_P2PDEVICE,
 	  (WPADBusMethodHandler) wpas_dbus_handler_add_persistent_group,
 	  {