ARM: dts: rockchip: raise GPU trip point temperatures for veyron

The values match those used by the downstream Chrome OS 3.14
kernel, the 'official' kernel for veyron devices. Keep the critical
trip point for speedy at 90°C as in the downstream configuration.

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