Enable apps to build with resource namespaces

Setting LOCAL_AAPT_NAMESPACES := true enables
namespaces for an app and requires any library resources
to be fully qualified by their package.

Test: manual
Bug: 73885582
Change-Id: Ia6bfc82ee8b8d6335f8e7c2abe94ce36467a012d
Merged-In: Ia6bfc82ee8b8d6335f8e7c2abe94ce36467a012d