On newer keyboards this key is in a different place. Add both options to
the keymap so that both new and old keyboards work.

Cc: Douglas Anderson <dianders@chromium.org>
Signed-off-by: NStephen Boyd <swboyd@chromium.org>
Reviewed-by: NDouglas Anderson <dianders@chromium.org>
Reviewed-by: NHeiko Stuebner <heiko@sntech.de>
Reviewed-by: NMatthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: NEnric Balletbo i Serra <enric.balletbo@collabora.com>