mips: octeon: ebb7304: Enable ethernet support

This patch enables the Kconfig symbols needed for full ethernet support
on the EBB7304. Also the PHY autonegotiation timeout is increased, as
the default 5 seconds are sometime a bit short. With this, ethernet can
be used on this board. Here an example of a tftp load:

=> tftp ffffffff81000000 big
ethernet-mac-nexus@11800e0000000 Waiting for PHY auto negotiation to complete....... done
Using ethernet-mac-nexus@11800e0000000 device
TFTP from server 192.168.1.5; our IP address is 192.168.1.243
Filename 'big'.
Load address: 0xffffffff81000000
Loading: ##################################################  10 MiB
         13.2 MiB/s
done
Bytes transferred = 10485760 (a00000 hex)

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/octeon_ebb7304.h b/include/configs/octeon_ebb7304.h
index 358db69..8c6c57b 100644
--- a/include/configs/octeon_ebb7304.h
+++ b/include/configs/octeon_ebb7304.h
@@ -16,4 +16,6 @@
 #define CONFIG_SYS_FLASH_CFI_WIDTH	FLASH_CFI_8BIT
 #define CONFIG_SYS_FLASH_EMPTY_INFO	/* flinfo indicates empty blocks */
 
+#define PHY_ANEG_TIMEOUT	8000	/* PHY needs a longer aneg time */
+
 #endif /* __CONFIG_H__ */