Expose forceUpdateUserSetupComplete as a TestAPI

This is needed to allow the new DPM#provisionFullyManagedDevice
API to work from CTS tests.

Bug: 175392542
Test: N/A
Change-Id: I79a18ef97deab1aa36b3f3d68e8f74b72794aab5

core/api/test-current.txt

@@ -371,6 +371,7 @@ package android.app {
 package android.app.admin {
 
   public class DevicePolicyManager {
+    method public void forceUpdateUserSetupComplete();
     method public long getLastBugReportRequestTime();
     method public long getLastNetworkLogRetrievalTime();
     method public long getLastSecurityLogRetrievalTime();

core/java/android/app/admin/DevicePolicyManager.java

@@ -11134,6 +11134,7 @@ public class DevicePolicyManager {
      *         {@code android.Manifest.permission.MANAGE_PROFILE_AND_DEVICE_OWNERS} or the caller is
      *         not {@link UserHandle#SYSTEM_USER}
      */
+    @TestApi
     public void forceUpdateUserSetupComplete() {
         try {
             mService.forceUpdateUserSetupComplete();