hal: support for for mi2s speaker adsp algo.

Change-Id: I77945be6eb8f853e29e394a51eb28fc8fb759b4a
diff --git a/hal/audio_hw.h b/hal/audio_hw.h
index 92cd5de..b4b2583 100644
--- a/hal/audio_hw.h
+++ b/hal/audio_hw.h
@@ -83,6 +83,7 @@
 
     USECASE_AUDIO_PLAYBACK_AFE_PROXY,
     USECASE_AUDIO_RECORD_AFE_PROXY,
+    USECASE_AUDIO_DSM_FEEDBACK,
 
     AUDIO_USECASE_MAX
 };