Add parent check on DevicePolicyManager.isSafeOperation()

Test: atest ManagedProfileTest#testParentProfileApiDisabled
Fixes: 180922138

Change-Id: I8b709edca8bd96569484be2f14bd7cb9768fa54e

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

@@ -2997,6 +2997,7 @@ public class DevicePolicyManager {
      */
     // TODO(b/173541467): should it throw SecurityException if caller is not admin?
     public boolean isSafeOperation(@OperationSafetyReason int reason) {
+        throwIfParentInstance("isSafeOperation");
         if (mService == null) return false;
 
         try {