Add dependency on system API in connectivity

The system API are moved to the connectivity module: add dependency on
the stubs from framework-tethering.

This only allows tethering to depend on system API defined by the
connectivity classes, not on any private code, even if they are
eventually bundled in the same APEX.

Bug: 171540887
Test: m

Merged-In: Iebfb3e01c5d2480e84edcfc76cf489520bd60237
Merged-In: Ic2491f04880ff66abc3b2d3aaee6168e18f6d68a
(clean cherry-pick from internal branch)

Change-Id: Iebfb3e01c5d2480e84edcfc76cf489520bd60237
diff --git a/Tethering/Android.bp b/Tethering/Android.bp
index 742fd02..320ba8f 100644
--- a/Tethering/Android.bp
+++ b/Tethering/Android.bp
@@ -41,6 +41,7 @@
         "netd-client",
     ],
     libs: [
+        "framework-connectivity",
         "framework-statsd.stubs.module_lib",
         "framework-tethering.impl",
         "framework-wifi",