arm64: dts: rockchip: enable tsadc on rk3399-puma

Enable the SoC thermal sensor on RK3399-Q7 (Puma).
As we want to do do a full board reset instead of just a SoC one, set
hw-tshut-mode to GPIO.

Signed-off-by: Klaus Goger <klaus.goger@theobroma-systems.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>