Add keycodes for diagonal dpad inputs

Change-Id: I7fe485bac5df58a20daed0c99d4849121851b81c
diff --git a/include/input/InputEventLabels.h b/include/input/InputEventLabels.h
index a38de00..606e8d9 100644
--- a/include/input/InputEventLabels.h
+++ b/include/input/InputEventLabels.h
@@ -307,6 +307,10 @@
     DEFINE_KEYCODE(STEM_1),
     DEFINE_KEYCODE(STEM_2),
     DEFINE_KEYCODE(STEM_3),
+    DEFINE_KEYCODE(DPAD_UP_LEFT),
+    DEFINE_KEYCODE(DPAD_DOWN_LEFT),
+    DEFINE_KEYCODE(DPAD_UP_RIGHT),
+    DEFINE_KEYCODE(DPAD_DOWN_RIGHT),
 
     { NULL, 0 }
 };