When an audio device disconnects from Android, custom audio patches
containing the device become invalidated.
AudioManager::updateAudioPortCache() used to fail in that case, but
it causes onAudioPortListUpdated() event never gets called so that
the creator of the custom audio patch cannot update it. Let
updateAudioPortCached() succeed even in the case so that the entity
that created the audio patch can get notified.
Bug: 18909299
Change-Id: If4f6ed73f69213d792117fb42aec103ae2e50b79
b561ccedd8