Add visibility for Connectivity tests

Allow all Connectivity test subpackages to use the targets,
so that the visibility does not need to be updated when test suites
are reorganized inside Connectivity.

Bug: 187935317
Test: m
Original-Change: https://android-review.googlesource.com/1729697
Merged-In: If06b89a1d3bdb678b6e6bd5e0d17ced50a254341
Change-Id: If06b89a1d3bdb678b6e6bd5e0d17ced50a254341