Revert "Revert "hal: add usb audio tunnel support""

This reverts commit 9d677f4174293e5fee17d0af71043bf0763495b5.

Change-Id: I5b685bf0b9e038818400d45cc1e73fa2c53f291b
Signed-off-by: David Lin <dtwlin@google.com>
diff --git a/hal/msm8916/platform.c b/hal/msm8916/platform.c
index f7953cc..65600ee 100644
--- a/hal/msm8916/platform.c
+++ b/hal/msm8916/platform.c
@@ -1093,6 +1093,13 @@
     return 0;
 }
 
+bool platform_check_and_set_playback_backend_cfg(struct audio_device* adev __unused,
+                                              struct audio_usecase *usecase __unused,
+                                              snd_device_t snd_device __unused)
+{
+    return false;
+}
+
 bool platform_check_and_set_capture_backend_cfg(struct audio_device* adev __unused,
                                               struct audio_usecase *usecase __unused,
                                               snd_device_t snd_device __unused)