Revert "Don't build hiddenapi flags or encode dex for unbundled builds"

This reverts commit 7b8a567f44.

Bug: 137282010
Test: With the CL above this one, the unbundled mainline module build
does not fail.

Change-Id: I2f49fa7dbe1da92cb282a9bc14acd5830888ed17

java/hiddenapi_singleton.go

@@ -64,7 +64,7 @@ func (h *hiddenAPISingleton) GenerateBuildActions(ctx android.SingletonContext)
 	stubFlagsRule(ctx)
 
 	// These rules depend on files located in frameworks/base, skip them if running in a tree that doesn't have them.
-	if ctx.Config().FrameworksBaseDirExists(ctx) && !ctx.Config().UnbundledBuild() {
+	if ctx.Config().FrameworksBaseDirExists(ctx) {
 		h.flags = flagsRule(ctx)
 		h.metadata = metadataRule(ctx)
 	} else {