Recognize 3D joysticks.

Change-Id: Ie4eae09c0334f69c2ccfcf7eaede075f9ba02eab
diff --git a/data/keyboards/Generic.kl b/data/keyboards/Generic.kl
index 6d925d6..33947e7 100644
--- a/data/keyboards/Generic.kl
+++ b/data/keyboards/Generic.kl
@@ -261,6 +261,23 @@
 # key 239 "KEY_KBDILLUMUP"
 # key 240 "KEY_UNKNOWN"
 
+key 256   BUTTON_1
+key 257   BUTTON_2
+key 258   BUTTON_3
+key 259   BUTTON_4
+key 260   BUTTON_5
+key 261   BUTTON_6
+key 262   BUTTON_7
+key 263   BUTTON_8
+key 264   BUTTON_9
+key 265   BUTTON_10
+key 266   BUTTON_11
+key 267   BUTTON_12
+key 268   BUTTON_13
+key 269   BUTTON_14
+key 270   BUTTON_15
+key 271   BUTTON_16
+
 key 288   BUTTON_1
 key 289   BUTTON_2
 key 290   BUTTON_3