Differentiate system and test apis in whitelist

@SystemApi and @TestApi entries in the whitelist can now be
differentiated from the rest of the public apis.

Test: m
Change-Id: Ie6a0108540cffe11992739d6391531401378f14b
diff --git a/java/hiddenapi_singleton.go b/java/hiddenapi_singleton.go
index ceafb59..86531eb 100644
--- a/java/hiddenapi_singleton.go
+++ b/java/hiddenapi_singleton.go
@@ -183,8 +183,8 @@
 		Text("list").
 		FlagForEachInput("--boot-dex=", bootDexJars).
 		FlagWithInputList("--public-stub-classpath=", publicStubPaths, ":").
-		FlagWithInputList("--public-stub-classpath=", systemStubPaths, ":").
-		FlagWithInputList("--public-stub-classpath=", testStubPaths, ":").
+		FlagWithInputList("--system-stub-classpath=", systemStubPaths, ":").
+		FlagWithInputList("--test-stub-classpath=", testStubPaths, ":").
 		FlagWithInputList("--core-platform-stub-classpath=", corePlatformStubPaths, ":").
 		FlagWithOutput("--out-api-flags=", tempPath)