ARM: dts: imx6qdl-sr-som: Sync with kernel 5.8-rc1

Sync the device tree with 5.8-rc1.

It basically contains the following extra kernel commit:

commit 86b08bd5b99480b79a25343f24c1b8c4ddcb5c09
Author: Russell King <rmk+kernel@armlinux.org.uk>
Date:   Wed Apr 15 16:44:17 2020 +0100

    ARM: dts: imx6-sr-som: add ethernet PHY configuration

    Add ethernet PHY configuration ahead of removing the quirk that
    configures the clocking mode for the PHY.  The RGMII delay is
    already set correctly.

    Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
    Reviewed-by: Fabio Estevam <festevam@gmail.com>
    Signed-off-by: Shawn Guo <shawnguo@kernel.org>

, which passes the 'qca,clk-out-frequency' property and it is important
to specify the correct frequency generated by the AR8035.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Tested-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/dts/imx6qdl-sr-som.dtsi b/arch/arm/dts/imx6qdl-sr-som.dtsi
index 6d7f6b9..b065778 100644
--- a/arch/arm/dts/imx6qdl-sr-som.dtsi
+++ b/arch/arm/dts/imx6qdl-sr-som.dtsi
@@ -53,10 +53,21 @@
 &fec {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_microsom_enet_ar8035>;
+	phy-handle = <&phy>;
 	phy-mode = "rgmii-id";
 	phy-reset-duration = <2>;
 	phy-reset-gpios = <&gpio4 15 GPIO_ACTIVE_LOW>;
 	status = "okay";
+
+	mdio {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		phy: ethernet-phy@0 {
+			reg = <0>;
+			qca,clk-out-frequency = <125000000>;
+		};
+	};
 };
 
 &iomuxc {