DO NOT MERGE: disable connectivity-tiramisu build

Disable framework-connectivity-tiramisu and do not include it in the
apex, and add empty filegroups and replacement stub classes to make
service-connectivity-tiramisu only contain
ConnectivityServiceInitializer.

This allows continuing to build the com.android.tethering APEX in the S
release branch, while minimizing build conflicts as T classes are being
prepared to move to it.

Bug: 206893064
Test: m com.android.tethering
Ignore-AOSP-First: sc-mainline-prod only.
Change-Id: I0c4e29568eadb6ef85ddadebbb37723adb9f29cd
diff --git a/framework-t/Android.bp b/framework-t/Android.bp
index abcfbeb..e9bd3ea 100644
--- a/framework-t/Android.bp
+++ b/framework-t/Android.bp
@@ -21,7 +21,7 @@
 
 java_defaults {
     name: "enable-framework-connectivity-t-targets",
-    enabled: true,
+    enabled: false,
 }
 // The above defaults can be used to disable framework-connectivity t
 // targets while minimizing merge conflicts in the build rules.