powerpc/85xx: cuboot - Fix up ethernet3 MAC address on MPC85xx

Some MPC85xx platforms do support 4 ethernet ports, so make sure the boot
wrapper fixes up all of them in the fdt.

Since MAC addresses are at the end of the bd_t structure there is no harm
in expanding to support 4 MAC address on older 85xx systems that might not
have that many.
Signed-off-by: NNate Case <ncase@xes-inc.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/cuboot-85xx.c

@@ -15,6 +15,7 @@
 #include "cuboot.h"
 
 #define TARGET_85xx
+#define TARGET_HAS_ETH3
 #include "ppcboot.h"
 
 static bd_t bd;
@@ -27,6 +28,7 @@ static void platform_fixups(void)
 	dt_fixup_mac_address_by_alias("ethernet0", bd.bi_enetaddr);
 	dt_fixup_mac_address_by_alias("ethernet1", bd.bi_enet1addr);
 	dt_fixup_mac_address_by_alias("ethernet2", bd.bi_enet2addr);
+	dt_fixup_mac_address_by_alias("ethernet3", bd.bi_enet3addr);
 	dt_fixup_cpu_clocks(bd.bi_intfreq, bd.bi_busfreq / 8, bd.bi_busfreq);
 
 	/* Unfortunately, the specific model number is encoded in the