ARM: dts: imx6-display5: replace marvell,88E1510 with ethernet-phy-ieee802.3-c22

Replace the vendor-specific PHY compatible string with the generic
ethernet-phy-ieee802.3-c22 compatible.

The marvell,88E1510 compatible is listed in whitelist_phys[] and is
never matched against a PHY driver. PHY devices are expected to use
the generic ethernet-phy-ieee802.3-c22 compatible unless a specific
MDIO driver match is required.

The 88E1510 is compatible with Clause 22 PHY devices, so use the
generic compatible string instead.

Fix below CHECK_DTBS warnings:
arch/arm/boot/dts/nxp/imx/imx6q-display5-tianma-tm070-1280x768.dtb: /soc/bus@2100000/ethernet@2188000/mdio/ethernet-phy@0: failed to match any schema with compatible: ['marvell,88E1510']

Known other user (uboot) did not use marvell,88E1510.

Signed-off-by: Frank Li <Frank.Li@nxp.com>

Author: nxpfrankli

arch/arm/boot/dts/nxp/imx/imx6q-display5.dtsi

@@ -208,7 +208,7 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 		ethernet_phy0: ethernet-phy@0 {
-			compatible = "marvell,88E1510";
+			compatible = "ethernet-phy-ieee802.3-c22";
 			device_type = "ethernet-phy";
 			/* Set LED0 control: */
 			/* On - Link, Blink - Activity, Off - No Link */