net: Move initialization of Au1x00 SoC ethernet MAC to cpu_eth_init

This patch will move au1x00_eth_initialize from net/eth.c to cpu_eth_init
as a part of ongoing eth_initialize cleanup work.  The function ret value
is also fixed as it should be negative on fail.

Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

cpu/mips/au1x00_eth.c

@@ -283,7 +283,7 @@ int au1x00_enet_initialize(bd_t *bis){
 
 	if ((dev = (struct eth_device*)malloc(sizeof *dev)) == NULL) {
 		puts ("malloc failed\n");
-		return 0;
+		return -1;
 	}
 
 	memset(dev, 0, sizeof *dev);

cpu/mips/cpu.c

@@ -23,6 +23,7 @@
 
 #include <common.h>
 #include <command.h>
+#include <netdev.h>
 #include <asm/mipsregs.h>
 #include <asm/cacheops.h>
 #include <asm/reboot.h>
@@ -73,3 +74,11 @@ void write_one_tlb(int index, u32 pagemask, u32 hi, u32 low0, u32 low1)
 	write_c0_index(index);
 	tlb_write_indexed();
 }
+
+int cpu_eth_init(bd_t *bis)
+{
+#ifdef CONFIG_SOC_AU1X00
+	au1x00_enet_initialize(bis);
+#endif
+	return 0;
+}