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 4c258d282b)
Change-Id: I7f80716119ad6ac627e5666def9fe17112dcde3b

java/java_test.go

@@ -1347,7 +1347,7 @@ func TestPatchModule(t *testing.T) {
 		checkPatchModuleFlag(t, ctx, "foo", "")
 		expected := "java.base=.:" + buildDir
 		checkPatchModuleFlag(t, ctx, "bar", expected)
-		expected = "java.base=" + strings.Join([]string{".", buildDir, moduleToPath("ext"), moduleToPath("framework"), moduleToPath("updatable_media_stubs")}, ":")
+		expected = "java.base=" + strings.Join([]string{".", buildDir, moduleToPath("ext"), moduleToPath("framework")}, ":")
 		checkPatchModuleFlag(t, ctx, "baz", expected)
 	})
 }