boards: native_sim: Associate sdl touch instance with display

Adds the device handle for the display to the zephyr,input-touch-sdl
instance.

Signed-off-by: Fabian Blatz <[email protected]>

Author: faxe1008

boards/native/native_sim/native_sim.dts

@@ -196,6 +196,7 @@
 
 	input_sdl_touch: input-sdl-touch {
 		compatible = "zephyr,input-sdl-touch";
+		display = <&sdl_dc>;
 	};
 
 	can_loopback0: can_loopback0 {