Merge "AudioSystem: fix missing audio port callbacks after audioserver restart" into main

        // TODO(b/375280520) consider registerClient() within mMutex lock.

        const int64_t token = IPCThreadState::self()->clearCallingIdentity();

        aps->registerClient(client);

        aps->setAudioPortCallbacksEnabled(client->isAudioPortCbEnabled());

        aps->setAudioVolumeGroupCallbacksEnabled(client->isAudioVolumeGroupCbEnabled());

        IPCThreadState::self()->restoreCallingIdentity(token);

    }