[Tether13] Move TetheringManager into framework

Move tethering out of ConnectivityService. All client would
use TetheringManager to talk with TetheringService directly.

Bug: 144320246
Test: -build, flash, boot
      -atest TetheringTests

Change-Id: Ib051bea724a256f9c4572b566e46ae7b9c4abe6e
diff --git a/services/core/Android.bp b/services/core/Android.bp
index b7adfa4..5b98f06 100644
--- a/services/core/Android.bp
+++ b/services/core/Android.bp
@@ -96,6 +96,7 @@
         "android.hardware.tv.cec-V1.0-java",
         "app-compat-annotations",
         "vintf-vibrator-java",
+        "framework-tethering",
     ],
 
     required: [