Move default HAL libraries to vendor

Libraries under /hardware/libhardware/modules should go to /vendor/.

These are conventionl HALs for default implementations, most of them
are not used.

Camera and thermal are already moved in other CLs.

Bug: 35907904
Test: Compiled and checked install path. Verified on Sailfish with
$ lsof | grep default.

Change-Id: Ibde574001c01cbfea014a20a0fbbb3265e6cdc8a
diff --git a/modules/usbaudio/Android.mk b/modules/usbaudio/Android.mk
index 9df1e79..b36bf9f 100644
--- a/modules/usbaudio/Android.mk
+++ b/modules/usbaudio/Android.mk
@@ -18,6 +18,7 @@
 
 LOCAL_MODULE := audio.usb.default
 LOCAL_MODULE_RELATIVE_PATH := hw
+LOCAL_PROPRIETARY_MODULE := true
 LOCAL_SRC_FILES := \
 	audio_hal.c
 LOCAL_C_INCLUDES += \