hal: HFP support for setting sampling rate

- Add support for setting sampling rate using setparameter. This
is to support 8000 or 16000 sampling rate set from BT

Change-Id: Ia6c7e530df0ba0226e492937e1c9acc70f6c6d13
diff --git a/hal/audio_hw.h b/hal/audio_hw.h
index 73575e8..205977b 100644
--- a/hal/audio_hw.h
+++ b/hal/audio_hw.h
@@ -65,6 +65,7 @@
 
     /* HFP Use case*/
     USECASE_AUDIO_HFP_SCO,
+    USECASE_AUDIO_HFP_SCO_WB,
 
     /* Capture usecases */
     USECASE_AUDIO_RECORD,