stm32mp257f_ev1_stm32mp257fxx_m33.dts: add i2c node

This commit adds the i2c8 node to the device tree for the
STM32MP257F-EV1 board. This node corresponds to the i2c exposed by the
GPIO expansion connector [1] and not used by the cortex A35.

[1]: https://wiki.st.com/stm32mpu/wiki/STM32MP257x-EV1_-_hardware_description

Signed-off-by: Tanguy Raufflet <tanguy.raufflet@savoirfairelinux.com>

Author: Tanguy Raufflet

boards/st/stm32mp257f_ev1/stm32mp257f_ev1_stm32mp257fxx_m33.dts

@@ -57,6 +57,10 @@
 	status = "okay";
 };
 
+&gpioz {
+	status = "okay";
+};
+
 &uart5 {
 	pinctrl-0 = <&uart5_tx_pg9 &uart5_rx_pg10>;
 	pinctrl-names = "default";
@@ -70,3 +74,9 @@
 	current-speed = <115200>;
 	status = "disabled";
 };
+
+&i2c8 {
+	pinctrl-0 = <&i2c8_scl_pz4 &i2c8_sda_pz3>;
+	pinctrl-names = "default";
+	status = "okay";
+};