beagle_x15: increase phy autoneg timeout

When Beagle X15 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 Beagle-X15 to handle
this case.
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Reviewed-by: NTom Rini <trini@konsulko.com>

include/configs/beagle_x15.h

@@ -59,6 +59,7 @@
 #define CONFIG_MII			/* Required in net/eth.c */
 #define CONFIG_PHY_GIGE			/* per-board part of CPSW */
 #define CONFIG_PHYLIB
+#define PHY_ANEG_TIMEOUT	8000	/* PHY needs longer aneg time at 1G */
 
 #define CONFIG_SUPPORT_EMMC_BOOT