SUW shouldn't use hidden APIs.

Make getDeviceOwnerNameOnAnyUser() a system API.

Bug 26142341

Change-Id: I481b26f45c35215b9221d96b66833af47fcf5cf0
diff --git a/core/java/android/app/admin/DevicePolicyManager.java b/core/java/android/app/admin/DevicePolicyManager.java
index e3d7c3d..6cf7049 100644
--- a/core/java/android/app/admin/DevicePolicyManager.java
+++ b/core/java/android/app/admin/DevicePolicyManager.java
@@ -3045,6 +3045,7 @@
      *
      * @hide
      */
+    @SystemApi
     public String getDeviceOwnerNameOnAnyUser() {
         if (mService != null) {
             try {