hal: enable USB audio ADSP solution for msmcobalt platform

enable USB audio ADSP solution for msmcobalt platform so the USB
audio uses primary audio instead of USB audio HAL.

Change-Id: I38739fc41a199b7b5698accf225895df5deee86d
CRs-Fixed: 1019158
diff --git a/hal/Android.mk b/hal/Android.mk
index 0143c2c..cf8533c 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -97,7 +97,7 @@
     LOCAL_SRC_FILES += audio_extn/fm.c
 endif
 
-ifeq ($(strip $(AUDIO_FEATURE_ENABLED_USBAUDIO)),true)
+ifeq ($(strip $(AUDIO_FEATURE_ENABLED_USB_TUNNEL_AUDIO)),true)
     LOCAL_CFLAGS += -DUSB_HEADSET_ENABLED
     LOCAL_SRC_FILES += audio_extn/usb.c
 endif