Support `m dist updatepackage`

If you want the `dist` behavior, but only want to build the
updatepackage (you only need to be able to flash the device).

Test: m dist updatepackage
Change-Id: I921f9d96ab3f7df180601dac3fff2ff24185792d
diff --git a/core/Makefile b/core/Makefile
index 40c374f..5d74509 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -4697,6 +4697,7 @@
 
 .PHONY: updatepackage
 updatepackage: $(INTERNAL_UPDATE_PACKAGE_TARGET)
+$(call dist-for-goals,updatepackage,$(INTERNAL_UPDATE_PACKAGE_TARGET))
 
 
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