Add KEYCODE_PAIRING.

Used for initiating a peripheral pairing mode.

Change-Id: I7e8439d27491ccc72d045cabf5751a35b9113aa7

include/android/keycodes.h

@@ -268,6 +268,7 @@ enum {
     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.

include/input/InputEventLabels.h

@@ -264,6 +264,7 @@ static const InputEventLabel KEYCODES[] = {
     DEFINE_KEYCODE(MEDIA_AUDIO_TRACK),
     DEFINE_KEYCODE(SLEEP),
     DEFINE_KEYCODE(WAKEUP),
+    DEFINE_KEYCODE(PAIRING),
 
     { NULL, 0 }
 };