powerpc/dts/fsl: t2080rdb: 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/t2080rdb.dts

@@ -97,12 +97,12 @@
 
 		mdio@fd000 {
 			xg_cs4315_phy1: ethernet-phy@c {
-				compatible = "ethernet-phy-ieee802.3-c45";
+				compatible = "ethernet-phy-id13e5.1002";
 				reg = <0xc>;
 			};
 
 			xg_cs4315_phy2: ethernet-phy@d {
-				compatible = "ethernet-phy-ieee802.3-c45";
+				compatible = "ethernet-phy-id13e5.1002";
 				reg = <0xd>;
 			};