Make printing policy a restriction.

Use existing API instead of creating new method.

Bug: 64140119
Test: cts-tradefed run cts-dev --module CtsDevicePolicyManagerTestCases --test com.android.cts.devicepolicy.MixedDeviceOwnerTest#testPrintingPolicy

Change-Id: I9ff94f4d73824e7bf9aedbb64811ad60fccf9779
diff --git a/services/core/java/com/android/server/pm/UserRestrictionsUtils.java b/services/core/java/com/android/server/pm/UserRestrictionsUtils.java
index 842f8d0..23185d7 100644
--- a/services/core/java/com/android/server/pm/UserRestrictionsUtils.java
+++ b/services/core/java/com/android/server/pm/UserRestrictionsUtils.java
@@ -122,7 +122,8 @@
             UserManager.DISALLOW_CONFIG_BRIGHTNESS,
             UserManager.DISALLOW_SHARE_INTO_MANAGED_PROFILE,
             UserManager.DISALLOW_AMBIENT_DISPLAY,
-            UserManager.DISALLOW_CONFIG_SCREEN_TIMEOUT
+            UserManager.DISALLOW_CONFIG_SCREEN_TIMEOUT,
+            UserManager.DISALLOW_PRINTING
     });
 
     /**