ARM: tegra: Add missing gpu-throt-level to Tegra124 soctherm

On Jetson TK1 the following message can be seen:

 tegra_soctherm 700e2000.thermal-sensor: throttle-cfg: heavy: no throt prop or invalid prop

This patch will fix the invalid prop issue according to the binding.

Signed-off-by: Nicolas Chauvet <kwizart@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra124.dtsi

@@ -910,6 +910,7 @@
 			throttle_heavy: heavy {
 				nvidia,priority = <100>;
 				nvidia,cpu-throt-percent = <85>;
+				nvidia,gpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_HIGH>;
 
 				#cooling-cells = <2>;
 			};