Add the new NetworkStack shim libraries to APEX allowed deps.

These are not currently tracked before because the shims are just
filegroups. aosp/1598155 is turning them into libraries so each
shim can build with the appropriate SDK version.

Test: m
Bug: 180894665
Change-Id: I9df3dd98d46f49943211cb0893493d628ddd157c
Merged-In: I9df3dd98d46f49943211cb0893493d628ddd157c