boards: st: stm32mp135f_dk: add touchscreen and lvgl pointer

STM32MP135F_DK board embeds a LCD screen with touchscreen driven by I2C5.
GT911 touchscreen already have driver support in Zephyr so just add
necessary nodes here.

Signed-off-by: Erwan SZYMANSKI <erwan.szymanski@st.com>

Author: eszSTM

boards/st/stm32mp135f_dk/stm32mp135f_dk.dts

@@ -23,6 +23,7 @@
 		zephyr,console = &uart4;
 		zephyr,shell-uart = &uart4;
 		zephyr,display = &ltdc;
+		zephyr,touch = &gt911;
 	};
 
 	gpio_keys {
@@ -59,6 +60,11 @@
 		};
 	};
 
+	lvgl_pointer {
+		compatible = "zephyr,lvgl-pointer-input";
+		input = <&gt911>;
+	};
+
 	aliases {
 		led0 = &blue_led_1;
 		led1 = &red_led_2;
@@ -181,6 +187,13 @@ csi_i2c: &i2c5 {
 			};
 		};
 	};
+
+	gt911: gt911@5d {
+		compatible = "goodix,gt911";
+		reg = <0x5d>;
+		reset-gpios = <&gpioh 2 GPIO_ACTIVE_LOW>;
+		irq-gpios = <&gpiof 5 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
+	};
 };
 
 csi_interface: &dcmipp {