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

Tethering/apex/Android.bp

@@ -88,7 +88,7 @@ bootclasspath_fragment {
     name: "com.android.tethering-bootclasspath-fragment",
     contents: [
         "framework-connectivity",
-        "framework-connectivity-tiramisu",
+        // Changed in sc-mainline-prod only: no framework-connectivity-tiramisu
         "framework-tethering",
     ],
     apex_available: ["com.android.tethering"],
@@ -111,11 +111,13 @@ bootclasspath_fragment {
     // modified by the Soong or platform compat team.
     hidden_api: {
         max_target_r_low_priority: [
-            "hiddenapi/hiddenapi-max-target-r-loprio.txt",
+            // Changed in sc-mainline-prod only: no list for
+            // framework-connectivity-tiramisu APIs as it is not in the APEX
 	],
         max_target_o_low_priority: [
             "hiddenapi/hiddenapi-max-target-o-low-priority.txt",
-            "hiddenapi/hiddenapi-max-target-o-low-priority-tiramisu.txt",
+            // Changed in sc-mainline-prod only: no list for
+            // framework-connectivity-tiramisu APIs as it is not in the APEX
 	],
         unsupported: ["hiddenapi/hiddenapi-unsupported.txt"],
     },