Deprecate getActiveLinkProperties.

There are other, more idiomatic ways to do this. Deprecating this
with usage limited to P will curb usage and reduce the maintenance
load.
This also deprecates the extra EXTRA_NETWORK_TYPE, which has
survived from an old world but has only been used in deprecated
broadcasts for some time.

Bug: 109783091
Test: eyeball current.txt
Change-Id: I87b74833bb4ec362ee3fd07511a66d318c29067d