Fix flaky testInBandRingtone

The test was flaky, it was frequently failing while verifying that all
the active phone calls were accounted for.  Since that process could
take as much as 2000 milliseconds increased the timeout by 50%.  Also
annotated the test as Large.

Bug: 72234627
Test: runtest bluetooth -c
com.android.bluetooth.hfpclient.HeadsetClientStateMachineTest

Change-Id: I1f5ce5dba9f7ae6b609c0ded24e51dd7f20633be