In bridged mode, the tethered interface will include the prefix ap_br_
Bug: 162686273
Test: Manual Test - bridged AP enabled success
and client can connected it and get the IP address
Test: atest -c NetworkStackTests
Test: atest -c FrameworksNetTests
Test: atest -c CtsNetTestCasesLatestSdk
Change-Id: I89ae178c658a42f902199afaed89ec798de54643