Don't use new API until flag can guard it

This CL is a partial revert of ag/33318019 and aosp3542309 which started
to comm about adb WIFI via the next adbd_auth API.

There is currenly no native API guard. Testing with  __builtin_available
is not enough since Framework cannot check if these events will be sent.
As a result, the only way to fix this problem in trunk-staging and bp3a
is to disable usage of the new API.

Bug: 420187719
Flag: EXEMPT (Revert)
Test: Manual
Change-Id: I3e37dd81822d48f990ceb011c2947d29b358a7de