Add keylayout for headsets

Bug: 16292420
Change-Id: Ib264e935cb34f2ccded350035babd92bfdf9c98d
diff --git a/h2w_headset.kl b/h2w_headset.kl
new file mode 100644
index 0000000..01f50ff
--- /dev/null
+++ b/h2w_headset.kl
@@ -0,0 +1,4 @@
+key 226   HEADSETHOOK
+key 217   VOICE_ASSIST
+key 115   VOLUME_UP
+key 114   VOLUME_DOWN