Add initial plumbing for brightness keys

Change-Id: I595e8a25e6c245e4b22f06df9a8acdbb75e4b041
diff --git a/data/keyboards/Vendor_05ac_Product_0239.kl b/data/keyboards/Vendor_05ac_Product_0239.kl
index 6bd3753..b0c358e 100644
--- a/data/keyboards/Vendor_05ac_Product_0239.kl
+++ b/data/keyboards/Vendor_05ac_Product_0239.kl
@@ -112,8 +112,8 @@
 key 164   MEDIA_PLAY_PAUSE
 key 165   MEDIA_PREVIOUS
 # key 204  show gadgets
-# key 224  reduce brightness
-# key 225  increase brightness
+key 224   BRIGHTNESS_DOWN
+key 225   BRIGHTNESS_UP
 # key 229  blank special function on F5
 # key 230  blank special function on F6
 key 464   FUNCTION