Revert^2 "Add service-connectivity to tethering APEX"

Add the connectivity service JAR to the tethering APEX.
This change should not be released in monthly updates until the
modularization work is done, so will be reverted in module release
branches.

This rolls forward the change. The original topic was reverted because
of a bad merged-in clause; this is fixed and re-verified in this topic.

Test: Boot, wifi connects and has internet access
Bug: 171540887

Change-Id: Ib0ac49609e444a53a6fee4575f5078e15f364eef

Tethering/apex/Android.bp

@@ -16,9 +16,17 @@
 
 apex {
     name: "com.android.tethering",
-    updatable: true,
-    min_sdk_version: "30",
-    java_libs: ["framework-tethering"],
+    // TODO: make updatable again once this contains only updatable artifacts (in particular, this
+    // cannot build as updatable unless service-connectivity builds against stable API).
+    // updatable: true,
+    // min_sdk_version: "30",
+    java_libs: [
+        "framework-tethering",
+        "service-connectivity",
+    ],
+    jni_libs: [
+        "libservice-connectivity",
+    ],
     bpfs: ["offload.o"],
     apps: ["Tethering"],
     manifest: "manifest.json",