Add wx_na_wf
AKA Nvidia Shield Tablet US WiFi model

Change-Id: I0b537d6d66a8bcf4b6acece2cc9fe265efcc16a6
diff --git a/slim.devices b/slim.devices
index ef6e977..91c0fa6 100644
--- a/slim.devices
+++ b/slim.devices
@@ -85,4 +85,5 @@
 v500
 vs980
 vs985
+wx_na_wf
 yuga