dts: Documentation: Update exynos-thermal.txt example for Exynos5440

Updating exynos-thermal.txt documentation entry for Exynos5440
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

Documentation/devicetree/bindings/thermal/exynos-thermal.txt

@@ -74,6 +74,7 @@ Example 2):
 		interrupts = <0 58 0>;
 		clocks = <&clock 21>;
 		clock-names = "tmu_apbif";
+		#include "exynos5440-tmu-sensor-conf.dtsi"
 	};
 
 Example 3): (In case of Exynos5420 "with misplaced TRIMINFO register")