ARM: dts: stm32: lxa-tac: reduce RGMII interface drive strength

This results in an improvement of EMI performance by reducing the
125MHz emission and its harmonics caused by the RGMII clock line.
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/stm32mp15xc-lxa-tac.dtsi

@@ -471,6 +471,10 @@ switch: switch@0 {
 		interrupt-parent = <&gpioa>;
 		interrupts = <6 IRQ_TYPE_EDGE_RISING>;
 
+		/* Reduce RGMII EMI emissions by reducing drive strength */
+		microchip,hi-drive-strength-microamp = <2000>;
+		microchip,lo-drive-strength-microamp = <8000>;
+
 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;