ARM: dts: imx6sx-udoo-neo: Pass the 'phy-reset-duration' property

imx6sx-udoo-neo has a KSZ8091 Ethernet PHY, which requires the reset
signal to be low for at least 10ms.

Pass the 'phy-reset-duration' property to reflect such requirement.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6sx-udoo-neo.dtsi

@@ -86,6 +86,7 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_enet1>;
 	phy-mode = "rmii";
+	phy-reset-duration = <10>;
 	phy-reset-gpios = <&gpio2 1 GPIO_ACTIVE_LOW>;
 };