Always build the updaters

The separation logic is from signing key, not build type. Let
the app makefiles decide

Change-Id: I71286d83148454d77c5e8c35b8c25762ea2d34d3
merge changes from CyanogenMod 10.2 into local branch

Conflicts:
	config/common.mk

Change-Id: I0e0a138b369690a5e96fd83906a963793e7b8515