hal: Add support for voip record low-latency

Add support for voip record low-latency path if app requests
for audio record with fast flag.

Change-Id: I2152a796cdb8c29142315c23cad7ec32f771f6b3
diff --git a/hal/audio_hw.h b/hal/audio_hw.h
index 6931d8d..403c2a5 100644
--- a/hal/audio_hw.h
+++ b/hal/audio_hw.h
@@ -247,6 +247,8 @@
 
     /*Audio FM Tuner usecase*/
     USECASE_AUDIO_FM_TUNER_EXT,
+    /*voip usecase with low latency path*/
+    USECASE_AUDIO_RECORD_VOIP_LOW_LATENCY,
     AUDIO_USECASE_MAX
 };