Expand SystemApi annotation for generating system api

Metalava apparently normalizes the SystemApi annotation that was
previously used to the form that this change uses so this is
effectively a no-op. However, this does make this code more
self-consistent and also matches the form that is used in the framework
defaults for the mainline modules.

Test: m checkapi
Bug: 155164730
Merged-In: Ic99b7333730ed8b918d8af72ae7bd6a851c2093a
Change-Id: Ic99b7333730ed8b918d8af72ae7bd6a851c2093a
(cherry picked from commit 0d543640d52e941219db0688f5756daabea5de78)
diff --git a/java/sdk_library.go b/java/sdk_library.go
index 361ac71..a02bde7 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -171,7 +171,7 @@
 		apiFilePrefix:  "system-",
 		moduleSuffix:   sdkSystemApiSuffix,
 		sdkVersion:     "system_current",
-		droidstubsArgs: []string{"-showAnnotation android.annotation.SystemApi"},
+		droidstubsArgs: []string{"-showAnnotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.PRIVILEGED_APPS\\)"},
 	})
 	apiScopeTest = initApiScope(&apiScope{
 		name:                "test",