ARM: dts: imx6dl-riotboard: configure PHY clock and set proper EEE value

Without SoC specific PHY fixups the network interface on this board will
fail to work. Provide missing DT properties to make it work again.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6dl-riotboard.dts

@@ -106,6 +106,8 @@ rgmii_phy: ethernet-phy@4 {
 			reset-gpios = <&gpio3 31 GPIO_ACTIVE_LOW>;
 			reset-assert-us = <10000>;
 			reset-deassert-us = <1000>;
+			qca,smarteee-tw-us-1g = <24>;
+			qca,clk-out-frequency = <125000000>;
 		};
 	};
 };