ARM: dts: stm32: lxa-tac: drive powerboard lines as open-drain

This results in a slight improvement in EMI performance due to the lines
no longer being driven by the somewhat noisy VDD_IO supply of the SoM.
Signed-off-by: Leonard Göhrs <l.goehrs@pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

arch/arm/boot/dts/st/stm32mp157c-lxa-tac-gen2.dts

@@ -148,7 +148,7 @@ adc@0 {
 		compatible = "ti,lmp92064";
 		reg = <0>;
 
-		reset-gpios = <&gpioa 4 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpioa 4 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 		shunt-resistor-micro-ohms = <15000>;
 		spi-max-frequency = <5000000>;
 		vdd-supply = <&reg_pb_3v3>;

arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi

@@ -409,7 +409,7 @@ &sdmmc2 {
 &spi2 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&spi2_pins_c>;
-	cs-gpios = <&gpiof 12 GPIO_ACTIVE_LOW>;
+	cs-gpios = <&gpiof 12 (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 };