ec/lenovo/h8: Implement sticky Fn option.

Useful for accessibility.

Sticky modifier (sticky Fn) is a behaviour of modifier key when
you don't have to hold it pressed to achieve the result. E.g.
with normal Fn brightness up is:
<Press Fn> <Press Home> <Despress Home> <Depress Fn>
With sticky Fn you can do:
<Press Fn> <Depress Fn> <Press Home> <Despress Home>

Change-Id: I4da5adcea02428d936023891de08684cae77c44e
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4661
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/src/mainboard/lenovo/x201/cmos.default b/src/mainboard/lenovo/x201/cmos.default
index ae57b97..772b024 100644
--- a/src/mainboard/lenovo/x201/cmos.default
+++ b/src/mainboard/lenovo/x201/cmos.default
@@ -10,3 +10,4 @@
 wwan=Enable
 touchpad=Enable
 fn_ctrl_swap=Disable
+sticky_fn=Disable