arm64: dts: imx8mp-verdin: Remove invalid property from eqos

Per nxp,dwmac-imx.yaml, it is not valid to pass 'phy-supply'.

The reg_module_eth1phy regulator is marked with 'regulator-always-on',
so it is safe to remove it from the eqos node.

Remove it to fix the following schema warning:

imx8mp-verdin-nonwifi-dahlia.dtb: ethernet@30bf0000: Unevaluated properties are not allowed ('phy-supply' was unexpected)
	from schema $id: http://devicetree.org/schemas/net/nxp,dwmac-imx.yaml#Signed-off-by: Fabio Estevam <festevam@denx.de>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi

@@ -184,7 +184,6 @@ &ecspi1 {
 &eqos {
 	phy-handle = <&ethphy0>;
 	phy-mode = "rgmii-id";
-	phy-supply = <&reg_module_eth1phy>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_eqos>;
 	snps,force_thresh_dma_mode;