export sonivox headers for users of libmedia

Test: build

Change-Id: Id4a9b00b25bfa572789c8858d6af542b644d35a9
diff --git a/media/libmedia/Android.mk b/media/libmedia/Android.mk
index f4d8bc0..2249222 100644
--- a/media/libmedia/Android.mk
+++ b/media/libmedia/Android.mk
@@ -59,7 +59,7 @@
         libcamera_client libstagefright_foundation \
         libgui libdl libaudioutils libaudioclient
 
-LOCAL_EXPORT_SHARED_LIBRARY_HEADERS := libbinder
+LOCAL_EXPORT_SHARED_LIBRARY_HEADERS := libbinder libsonivox
 
 LOCAL_WHOLE_STATIC_LIBRARIES := libmedia_helper