Annotating a class with @SystemApi makes its members @SystemApi

This change fixes a bug that annotating a class in services.jar as
@SystemApi doesn't automatically make its member fields and methods as
@SystemApi. The problem was due to a wrong option to the metalava.

Bug: 147322525
Test: cherry-pick ag/10037363 and `m update-api`.
services/api/current.txt contains all the symbols from the
SystemService class.

Change-Id: I30a515761f8d1792593f207fa4e268ab68a81480
diff --git a/services/Android.bp b/services/Android.bp
index 80452f1..943e491 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -111,7 +111,7 @@
     srcs: [":services-sources"],
     installable: false,
     // TODO: remove the --hide options below
-    args: " --show-single-annotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.MODULE_LIBRARIES,process=android.annotation.SystemApi.Process.SYSTEM_SERVER\\)" +
+    args: " --show-annotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.MODULE_LIBRARIES,process=android.annotation.SystemApi.Process.SYSTEM_SERVER\\)" +
         " --hide-annotation android.annotation.Hide" +
         " --hide-package com.google.android.startop.iorap" +
         " --hide ReferencesHidden" +