audio: Verify that hal implements get_audio_port before calling

Return<void> Device::getAudioPortImpl(const AudioPort& port, getAudioPort_cb _hidl_cb,

                                      int (*halGetter)(audio_hw_device_t*, HalPort*),

                                      const char* halGetterName) {

    if (halGetter == nullptr) {

        _hidl_cb(Result::NOT_SUPPORTED, port);

        return Void();

    }

    HalPort halPort;

    if (status_t status = HidlUtils::audioPortToHal(port, &halPort); status != NO_ERROR) {

        _hidl_cb(analyzeStatus("audioPortToHal", status), port);