arm64: dts: rockchip: Add main thermal info to rk3368.dtsi

This patch add the thermal needed info on RK3368.
Meanwhile, support the trips to throttle for thermal.

Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>