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
Change-Id: I7f80716119ad6ac627e5666def9fe17112dcde3b

java/testing.go

@@ -38,7 +38,6 @@ func GatherRequiredDepsForTest() string {
 	extraModules := []string{
 		"core-lambda-stubs",
 		"ext",
-		"updatable_media_stubs",
 		"android_stubs_current",
 		"android_system_stubs_current",
 		"android_test_stubs_current",