Add service-supplementalprocess to combined_apis

Test: m
Bug: 212577961
Change-Id: Id05c53612ec5a6fe9abeaed441da5c8b164844ce
diff --git a/api/Android.bp b/api/Android.bp
index 362f39f..a22c2f6 100644
--- a/api/Android.bp
+++ b/api/Android.bp
@@ -133,6 +133,7 @@
     system_server_classpath: [
         "service-media-s",
         "service-permission",
+        "service-supplementalprocess",
     ],
 }