Allow creating and starting of AudioRecord if appop is ignored

According to the documentation MODE_IGNORED is supposed to cause a
silent failure so in this case we want to successfully create and start
the recording but the difference between this an MODE_ALLOWED is that
the audio content should be silenced.

Test: Install sdk 22 app, revoke permission, observe no more crash
      Observe GCA doesn't crash anymore when trying to record a video
          using the microphone toggle
      atest NoAudioPermissionTest AudioRecordAppOpTest AudioRecordAppOpTest
      atest audiopolicy_tests
Fixes: 185939466
Change-Id: I6e6c6ab36c597bdf0f71f28fe6350f83d4ccb601