The generic operating points specified in rk3288.dtsi are specified by
Rockchip as conservative and for all cases.

In contrast the Veyron ChromeOS devices are supposed to use a special
chip variant often called rk3288-c and use different operating points
in their kernel also including a higher max frequency.

So override the operating points for veyron devices.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Douglas Anderson <dianders@chromium.org>