Add Voice Assist key.

Bug: 16292420
Change-Id: I607fadc2edf673079bfd9f7406e6e45603474957
diff --git a/include/input/InputEventLabels.h b/include/input/InputEventLabels.h
index 51f7661..279ac40 100644
--- a/include/input/InputEventLabels.h
+++ b/include/input/InputEventLabels.h
@@ -270,6 +270,7 @@
     DEFINE_KEYCODE(12),
     DEFINE_KEYCODE(LAST_CHANNEL),
     DEFINE_KEYCODE(TV_DATA_SERVICE),
+    DEFINE_KEYCODE(VOICE_ASSIST),
 
     { NULL, 0 }
 };