am437x_evm: increase phy autoneg timeout

When AM437x EVM is connected to Gigabit switch, it takes
more time to finish auto-negotiation than on a 10/100 switch.

The default 4 second limit times-out more often than not. This is
observed when testing with a D-Link DGS-1008A desktop switch.

Increase the auto-negotiation time-out for AM437x EVM to handle
this case.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>

include/configs/am43xx_evm.h

@@ -329,6 +329,7 @@
 
 #define CONFIG_DRIVER_TI_CPSW
 #define CONFIG_PHYLIB
+#define PHY_ANEG_TIMEOUT	8000 /* PHY needs longer aneg time at 1G */
 
 #define CONFIG_SPL_ENV_SUPPORT
 #define CONFIG_SPL_NET_VCI_STRING	"AM43xx U-Boot SPL"