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.

Bug: N/A
Test: m

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

Merged-In: Ib627523aab44b7c41d27d70c6ae34cda5dc2e27c
(cherry picked from commit 92721349d9)
Change-Id: Ib627523aab44b7c41d27d70c6ae34cda5dc2e27c

Android.bp

@@ -459,6 +459,7 @@ java_library {
     installable: false, // this lib is a build-only library
     static_libs: [
         "framework-minus-apex",
+        "updatable_media_stubs",
         "framework-sdkext-stubs-systemapi",
         // TODO(jiyong): add more stubs for APEXes here
     ],