powerpc/dts/fsl: t4240rdb: use the Cortina PHY driver compatible

The Cortina PHY is not compatible with IEEE 802.3 clause 45.

Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
[scottwood: made commit message about compatibility, not driver choice]
Signed-off-by: Scott Wood <oss@buserror.net>

arch/powerpc/boot/dts/fsl/t4240rdb.dts

@@ -267,22 +267,22 @@
 
 			mdio@fd000 {
 				xfiphy1: ethernet-phy@10 {
-					compatible = "ethernet-phy-ieee802.3-c45";
+					compatible = "ethernet-phy-id13e5.1002";
 					reg = <0x10>;
 				};
 
 				xfiphy2: ethernet-phy@11 {
-					compatible = "ethernet-phy-ieee802.3-c45";
+					compatible = "ethernet-phy-id13e5.1002";
 					reg = <0x11>;
 				};
 
 				xfiphy3: ethernet-phy@13 {
-					compatible = "ethernet-phy-ieee802.3-c45";
+					compatible = "ethernet-phy-id13e5.1002";
 					reg = <0x13>;
 				};
 
 				xfiphy4: ethernet-phy@12 {
-					compatible = "ethernet-phy-ieee802.3-c45";
+					compatible = "ethernet-phy-id13e5.1002";
 					reg = <0x12>;
 				};
 			};