Create all variants of stubs for media

Add separate publicapi, systemapi and module_libs stubs for media,
and rename the updatable_media stubs to framework-media to match
the others. The impl jar still has the name updatable_media.

Bug: 147768409
Test: m
Test: m framework-media-stubs-{public,system,module_libs_}api
Change-Id: I498823de7315f78121975d36d6dc7667a8245085