Add updatable_media_stub to framework

The module framework is now a build-only library whose purpose is to
provide hidden APIs from the non-updatable part of the platform and APIs
from the modules. Merging updatable_media_stub to framework, like the
stub libraries from other modules.

As a result, updatable_media_stub can be removed from DefaultLibraries.

Bug: N/A
Test: m

Exempt-From-Owner-Approval: cherry-pick from internal

Merged-In: I7f80716119ad6ac627e5666def9fe17112dcde3b
(cherry picked from commit 4c258d28)
Change-Id: I7f80716119ad6ac627e5666def9fe17112dcde3b