Add com.android.tradefed.utils.wifi to Whitelist

Bug 5898230

Change-Id: I85469d998e5a57a7edb2310b76b2285d446f7e4c
diff --git a/tests/tests/security/src/android/security/cts/PackageSignatureTest.java b/tests/tests/security/src/android/security/cts/PackageSignatureTest.java
index 3822035..5670cdd 100644
--- a/tests/tests/security/src/android/security/cts/PackageSignatureTest.java
+++ b/tests/tests/security/src/android/security/cts/PackageSignatureTest.java
@@ -83,7 +83,10 @@
             "android.tests.devicesetup",
 
             // APK for the Android core tests runner used only during CTS
-            "android.core.tests.runner"
+            "android.core.tests.runner",
+
+            // Wifi test utility used by Tradefed...
+            "com.android.tradefed.utils.wifi"
             ));
 
     private boolean isWhitelistedPackage(String packageName) {