ARM: dts: BCM953012HR: Add ethernet aliases

Adding ethernet aliases.  These are used, for example, by bootloaders,
to modify the MAC addresses in the device tree.
Signed-off-by: NSteve Lin <steven.lin1@broadcom.com>
Acked-by: NJon Mason <jon.mason@broadcom.com>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm953012hr.dts

@@ -41,6 +41,9 @@
 
 	aliases {
 		serial0 = &uart0;
+		ethernet0 = &gmac0;
+		ethernet1 = &gmac1;
+		ethernet2 = &gmac2;
 	};
 
 	chosen {