powerpc: dts: qoriq: update the mdio offsets under the second FMan v3

When two FMan's are present on a board, the MDIO nodes are found at the
same offsets inside each FMan. This causes "non unique device name"
errors when registering the MDIO nodes under the second FMan. Fix this
by updating the offsets of the MDIO nodes to include the parent FMan's
offset.

Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/arch/powerpc/dts/t4240rdb.dts b/arch/powerpc/dts/t4240rdb.dts
index 6d31675..b3251e3 100644
--- a/arch/powerpc/dts/t4240rdb.dts
+++ b/arch/powerpc/dts/t4240rdb.dts
@@ -100,7 +100,7 @@
 			phy-connection-type = "xgmii";
 		};
 
-		mdio@fc000 {
+		mdio@5fc000 {
 			sgmiiphy21: ethernet-phy@0 {
 				reg = <0x0>;
 			};
@@ -134,7 +134,7 @@
 			};
 		};
 
-		mdio@fd000 {
+		mdio@5fd000 {
 			xfiphy1: ethernet-phy@10 {
 				compatible = "ethernet-phy-id13e5.1002";
 				reg = <0x10>;