Move nearby apex to tethering

Nearby will be merged together with the tethering/connectivity APEX, so
that module maintenance efforts can be reduced, and the two codebases
can evolve the interfaces that they expose to each other over time.

Bug: 189355156
Test: m
Change-Id: I7c34466a850cb437171ea15367a24f84305bd3f7
diff --git a/nearby/service/proto/Android.bp b/nearby/service/proto/Android.bp
index 9eca51d..d8c059e 100644
--- a/nearby/service/proto/Android.bp
+++ b/nearby/service/proto/Android.bp
@@ -25,7 +25,7 @@
     min_sdk_version: "30",
     srcs: ["src/*/*.proto"],
     apex_available: [
-        "com.android.nearby",
+        "com.android.tethering",
     ],
 }