Make availability to com.android.tethering explicit

This is done implicitly today via a baseline map in
build/soong/apex/apex.go

The hidl_interface also requires //apex_available:platform in its
apex_available. This lib gets installed in vendor, and
//apex_available:platform is required on all non-apex variants including
the vendor variants

Bug: 281077552
Test: m nothing
Change-Id: I6f46244f9122fb3e025af53f3a42ad441284a723
diff --git a/tetheroffload/config/1.0/Android.bp b/tetheroffload/config/1.0/Android.bp
index 116c9b6..b5c4185 100644
--- a/tetheroffload/config/1.0/Android.bp
+++ b/tetheroffload/config/1.0/Android.bp
@@ -19,4 +19,8 @@
         "android.hidl.base@1.0",
     ],
     gen_java: true,
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.tethering",
+    ],
 }
diff --git a/tetheroffload/control/1.0/Android.bp b/tetheroffload/control/1.0/Android.bp
index acb5ee8..6589ee2 100644
--- a/tetheroffload/control/1.0/Android.bp
+++ b/tetheroffload/control/1.0/Android.bp
@@ -21,4 +21,8 @@
         "android.hidl.base@1.0",
     ],
     gen_java: true,
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.tethering",
+    ],
 }