usbaudio: add initial usbaudio default HAL

Change-Id: I6e93b2512883f3697683a74cadb9a29113966bc0
diff --git a/modules/Android.mk b/modules/Android.mk
index b8b83ba..871b984 100644
--- a/modules/Android.mk
+++ b/modules/Android.mk
@@ -1,2 +1,2 @@
-hardware_modules := gralloc hwcomposer audio nfc local_time power
+hardware_modules := gralloc hwcomposer audio nfc local_time power usbaudio
 include $(call all-named-subdir-makefiles,$(hardware_modules))