Redefined core and core platform API surface java_library using the
product variable build_from_text_stub so that the correct static libs
are linked based on build configuration
Test: m --build-from-text-stub and verify no ninja path between "core.current.stubs" and "core.current.stubs.from-source"
Bug: 285410821
Change-Id: I26febc65697be6278624a504ffbb61be0953d798
67b6443258