ARM: dts: rockchip: Remove #address/#size-cells from rk3288-veyron gpio-keys

They are pointless.  As dtc points out:
  Warning (avoid_unnecessary_addr_size):
  /gpio-keys:
  unnecessary #address-cells/#size-cells without "ranges" or child "reg" property

Let's remove them.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>