Audio VTS: Reset HAL after setConnectionState

There is no way of restoring the HAL state without restarting it.

Bug: 111681420
Test: atest VtsHalAudioV4_0TargetTest
      Check that the HAL is restarting after the test in the logcat
Change-Id: I9e3d9da08ed9e8dc25c7fc05c2bafa5455727508
Signed-off-by: Kevin Rocard <krocard@google.com>