Revert^2 "Define FeatureFlagsService."

This revert contains one small fix: The prior change included
changes in core/java/Android.bp and a corresponding line in
services/flags/Android.bp that causes problems in
StrictJavaPackagesTest
#testBootClasspathAndSystemServerClasspath_nonDuplicateClasses

Specifically resulting in this bug being filed: http://b/290929382


de960774a08274e68a4021e706f7611f0c0a880e

Bug: 279054964
Change-Id: Ia2ac95bb22144ff8be84c711604db72d039a814d
diff --git a/services/Android.bp b/services/Android.bp
index b0a0e5e..453f572 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -159,6 +159,7 @@
         "services.coverage",
         "services.credentials",
         "services.devicepolicy",
+        "services.flags",
         "services.midi",
         "services.musicsearch",
         "services.net",