HidHostDualModeTest: Use Mockito to wait for events instead of Future

* This helps get rid of unncessary broadcast receiver and listener
  classes
* Before this change, there is no gurantee that A2DP, HFP, and HID_HOST
  service proxy will be connected on time during setUp() function. This
  change ensures that we always wait for service proxy connections
* Before this change, some times the Future is created after calling the
  method under test, if the future is completed before the Future is
  completed, then we will wait forever for the future. This change makes
  sure this race condition won't happen

Bug: 361800494
Test: atest -v HidHostDualModeTest
Flag: EXEMPT TEST_ONLY
Change-Id: I1422902152c69501dd8ccce4811a71d37bfcd51d