Rename Kotlin util files to not include the Kt suffix

Callers don't care what language the utilities are written in

Test: builds
Change-Id: Ie212144f36c50db223c05f3fcb6bad745842cb5e

tests/net/java/com/android/internal/net/VpnProfileTest.java

@@ -16,7 +16,7 @@
 
 package com.android.internal.net;
 
-import static com.android.testutils.ParcelUtilsKt.assertParcelSane;
+import static com.android.testutils.ParcelUtils.assertParcelSane;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;