Use adb_auth channel to send TLS Server port

ADB Wifi was written back when AdbDebuggingManager was no guaranteed to
be running. The workaround to communicate from adbd to Framework was to
use a global variable which makes timing undeterministic and code hard
to read.

Now that AdbDebuggingManager is always instantiated, we can rely on
the AdbDebuggingThread channel.

Fixes: 402927103
Test: NA

Change-Id: Ied1a7574b8883edb00a7148a596f0adbc73d0cdd