boards: st: nucleo_h7s3l8: fix user button configuration

There is no external pull-up/pull-down resistor on the pin so an
internal one must be enabled. Since the button ties the pin low, enable
a pull-up and change the button's polarity to Active-Low.

Signed-off-by: Mathieu Choplain <mathieu.choplain-ext@st.com>

Author: mathieuchopstm

boards/st/nucleo_h7s3l8/nucleo_h7s3l8-common.dtsi

@@ -44,7 +44,7 @@
 
 		user_button: button_0 {
 			label = "User";
-			gpios = <&gpioc 13 GPIO_ACTIVE_HIGH>;
+			gpios = <&gpioc 13 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
 			zephyr,code = <INPUT_KEY_0>;
 		};
 	};