mediatek: remove left-over reference to make_gl_metadata.py

When adding support for the GL.iNet GL-MT3000 a reference to the
non-existent make_gl_metadata.py script was accidentally added.
Remove it, flashing from vendor firmware also works fine without that.

Signed-off-by: Daniel Golle <[email protected]>

target/linux/mediatek/image/filogic.mk

@@ -53,9 +53,7 @@ metadata_gl_json = \
 			"revision": "$(call json_quote,$(REVISION))", \
 			"target": "$(call json_quote,$(TARGETID))", \
 			"board": "$(call json_quote,$(if $(BOARD_NAME),$(BOARD_NAME),$(DEVICE_NAME)))" \
-		}, \
-		"upgrade_control":"$(shell python3 $(TOPDIR)/make_gl_metadata.py)", \
-		"release_note":"$(shell sed ':a;N;s/\n/\\n/g;s/\r/\\r/g;ta' $(TOPDIR)/gl_release_note)" \
+		} \
 	}'
 
 define Build/append-gl-metadata