ARM: dts: stm32mp1: DT alignment with kernel v5.5-rc7

Device tree and binding alignment with kernel v5.5-rc7

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/arch/arm/dts/stm32mp157c-dk2.dts b/arch/arm/dts/stm32mp157c-dk2.dts
index 020ea0f..d26adcb 100644
--- a/arch/arm/dts/stm32mp157c-dk2.dts
+++ b/arch/arm/dts/stm32mp157c-dk2.dts
@@ -53,6 +53,19 @@
 	};
 };
 
+&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";