ARM: dts: rockchip: Add missing the touchscreen interrupt on rk3288-phycore-rdk

According to the phyCORE - RK3288 Hardware Manual, GPIO5_B4 corresponds to
the touchscreen interrupt line:

https://www.phytec.eu/fileadmin/legacy/downloads/Manuals/L-826e_1.pdf

Describe it to improve the devicetree representation.

This fixes the following dt-schema warning:

	'interrupts' is a required property
	'interrupts-extended' is a required property

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://patch.msgid.link/20260303193855.828892-1-festevam@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: fabioestevam

arch/arm/boot/dts/rockchip/rk3288-phycore-rdk.dts

@@ -86,6 +86,10 @@
 	touchscreen@44 {
 		compatible = "st,stmpe811";
 		reg = <0x44>;
+		interrupt-parent = <&gpio5>;
+		interrupts = <RK_PB4 IRQ_TYPE_EDGE_FALLING>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&ts_irq_pin>;
 	};
 
 	adc@64 {
@@ -199,7 +203,7 @@
 
 	touchscreen {
 		ts_irq_pin: ts-irq-pin {
-			rockchip,pins = <5 RK_PB7 RK_FUNC_GPIO &pcfg_pull_none>;
+			rockchip,pins = <5 RK_PB4 RK_FUNC_GPIO &pcfg_pull_up>;
 		};
 	};