Using common apex_defaults for com.android.tethering module.

In /packages/modules/common/sdk/ModuleDefaults.bp file, some
apex_defaults are added to provide common parameters corresponding to
Q, R, S, and T releases.
(Refer to CL link for above mentioned change -
https://android-review.googlesource.com/c/platform/packages/modules/common/+/2005890?forceReload=true)

This CL is using the apex_default corresponding to R release for the
com.google.android.tethering module.

Bug: 172589606
Test: USE_RBE=true m
Since there are no runtime changes, successful code build is enough for
testing.

Change-Id: I4b3b3d6add96da1ee4421227996b54f7b96bc2c2

Tethering/apex/Android.bp

@@ -38,10 +38,11 @@ enable_tethering_next_apex = true
 
 apex {
     name: "com.android.tethering",
-    defaults: ["ConnectivityApexDefaults"],
+    defaults: [
+        "ConnectivityApexDefaults",
+        "r-launched-apex-module",
+    ],
     compile_multilib: "both",
-    updatable: true,
-    min_sdk_version: "30",
     bootclasspath_fragments: [
         "com.android.tethering-bootclasspath-fragment",
     ],