ARM: dts: stm32: add focaltech touchscreen on stm32mp157c-dk2 board

Enable focaltech ft6236 touchscreen on STM32MP157C-DK2 board.

Signed-off-by: Yannick Fertré <[e-mail]>
Signed-off-by: Alexandre Torgue <[e-mail]>

arch/arm/boot/dts/stm32mp157c-dk2.dts

···
 	};
 };
 
+&i2c1 {
+	touchscreen@38 {
+		compatible = "focaltech,ft6236";
+		reg = <0x38>;
+		interrupts = <2 2>;
+		interrupt-parent = <&gpiof>;
+		interrupt-controller;
+		touchscreen-size-x = <480>;
+		touchscreen-size-y = <800>;
+		status = "okay";
+	};
+};
+
 &ltdc {
 	status = "okay";