Add bt dep for tethering tests

Bug: 217736913
Test: Compile, bringup and test user journeys
Ignore-AOSP-First: framework-bluetooth.stubs.module_lib is not yet ready on AOSP
Change-Id: I37a2f3406c24a6bc6fd2d0eb2061fdb7a4240195
diff --git a/Tethering/tests/unit/Android.bp b/Tethering/tests/unit/Android.bp
index 224d87a..ab4ee37 100644
--- a/Tethering/tests/unit/Android.bp
+++ b/Tethering/tests/unit/Android.bp
@@ -67,6 +67,7 @@
         "ext",
         "framework-minus-apex",
         "framework-res",
+        "framework-bluetooth.stubs.module_lib",
         "framework-connectivity.impl",
         "framework-connectivity-tiramisu.impl",
         "framework-tethering.impl",