powerpc/kmcent2: update the ethernet devices' phy properties

Change all phy-connection-type properties to phy-mode that are better
supported by the fman driver.

Use the more readable fixed-link node for the 2 sgmii links.

Change the RGMII link to rgmii-id as the clock delays are added by the
phy.
Signed-off-by: Valentin Longchamp <valentin@longchamp.me>
Acked-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: Scott Wood <oss@buserror.net>

arch/powerpc/boot/dts/fsl/kmcent2.dts

@@ -210,13 +210,19 @@ sata@221000 {
 
 		fman@400000 {
 			ethernet@e0000 {
-				fixed-link = <0 1 1000 0 0>;
-				phy-connection-type = "sgmii";
+				phy-mode = "sgmii";
+				fixed-link {
+					speed = <1000>;
+					full-duplex;
+				};
 			};
 
 			ethernet@e2000 {
-				fixed-link = <1 1 1000 0 0>;
-				phy-connection-type = "sgmii";
+				phy-mode = "sgmii";
+				fixed-link {
+					speed = <1000>;
+					full-duplex;
+				};
 			};
 
 			ethernet@e4000 {
@@ -229,7 +235,7 @@ ethernet@e6000 {
 
 			ethernet@e8000 {
 				phy-handle = <&front_phy>;
-				phy-connection-type = "rgmii";
+				phy-mode = "rgmii-id";
 			};
 
 			mdio0: mdio@fc000 {