Add Bluetooth Hearing Aid routing and configuration

Bug: 69623109
Test: connect to Hearing Aid, make phone call, verify audio is heard
Change-Id: I92267fb48608fb721c5c4ef7ec9fceeafc8ea192
diff --git a/services/audiopolicy/common/include/Volume.h b/services/audiopolicy/common/include/Volume.h
index 1239fe0..4862684 100644
--- a/services/audiopolicy/common/include/Volume.h
+++ b/services/audiopolicy/common/include/Volume.h
@@ -125,6 +125,7 @@
         case AUDIO_DEVICE_OUT_BLUETOOTH_A2DP:
         case AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES:
         case AUDIO_DEVICE_OUT_USB_HEADSET:
+        case AUDIO_DEVICE_OUT_HEARING_AID:
             return DEVICE_CATEGORY_HEADSET;
         case AUDIO_DEVICE_OUT_LINE:
         case AUDIO_DEVICE_OUT_AUX_DIGITAL: