Merge "Don't ask policy manager about invalid stream type"

        uint32_t strategy = AudioSystem::getStrategyForStream(streamType);

        for (size_t i = 0; i < mTracks.size(); ++i) {

            sp<Track> t = mTracks[i];

            if (t != 0) {

            if (t != 0 && !t->isOutputTrack()) {

                uint32_t actual = AudioSystem::getStrategyForStream(t->streamType());

                if (sessionId == t->sessionId() && strategy != actual) {

                    ALOGE("createTrack_l() mismatched strategy; expected %u but found %u",