Add KEYCODE_PAIRING.

Used for initiating a peripheral pairing mode.

Change-Id: I7e8439d27491ccc72d045cabf5751a35b9113aa7
diff --git a/include/android/keycodes.h b/include/android/keycodes.h
index b6a5f4c..a2f01a4 100644
--- a/include/android/keycodes.h
+++ b/include/android/keycodes.h
@@ -268,6 +268,7 @@
     AKEYCODE_MEDIA_AUDIO_TRACK = 222,
     AKEYCODE_SLEEP           = 223,
     AKEYCODE_WAKEUP          = 224,
+    AKEYCODE_PAIRING         = 225,
 
     // NOTE: If you add a new keycode here you must also add it to several other files.
     //       Refer to frameworks/base/core/java/android/view/KeyEvent.java for the full list.