powerpc/85xx: mpc8548cds - fix alias in mpc8548si-pre.dtsi

Correct ethernet1 and add ethernet2 and ethernet3.
Signed-off-by: NZhao Chenhui <chenhui.zhao@freescale.com>
Signed-off-by: NLi Yang <leoli@freescale.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/dts/fsl/mpc8548si-pre.dtsi

@@ -43,7 +43,9 @@
 		serial0 = &serial0;
 		serial1 = &serial1;
 		ethernet0 = &enet0;
-		ethernet1 = &enet2;
+		ethernet1 = &enet1;
+		ethernet2 = &enet2;
+		ethernet3 = &enet3;
 		pci0 = &pci0;
 		pci1 = &pci1;
 		pci2 = &pci2;