audiohal: Add missing ABOX interface types

Change-Id: Ie10594bb3898012c3dc463e39ebed95935daf2aa
diff --git a/include/libaudio/audiohal/audio_proxy_interface.h b/include/libaudio/audiohal/audio_proxy_interface.h
index 437bd48..a8da251 100644
--- a/include/libaudio/audiohal/audio_proxy_interface.h
+++ b/include/libaudio/audiohal/audio_proxy_interface.h
@@ -59,6 +59,13 @@
 
 };
 
+/* A-Box Interface Type */
+enum {
+    UAIF0 = 0,
+    UAIF1,
+    UAIF2,
+    UAIF3,
+};
 
 // Audio Capability Check  Utility Functions
 int  get_supported_device_number(void *proxy, int device_type);