net: e1000: Increase autoneg timeout to 8 seconds

The current 4.5 timeout for the autonegotiation are not enough to
complete it on my platform. Using the Intel E1000 PCIe card in the
Marvell db-mv784mp-gp eval board. So lets increase the timeout to
8 seconds.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/drivers/net/e1000.h b/drivers/net/e1000.h
index 232c95d..23a81e6 100644
--- a/drivers/net/e1000.h
+++ b/drivers/net/e1000.h
@@ -2460,7 +2460,7 @@
 #define MII_CR_SPEED_100		0x2000
 #define MII_CR_SPEED_10		0x0000
 #define E1000_PHY_ADDRESS		0x01
-#define PHY_AUTO_NEG_TIME		45	/* 4.5 Seconds */
+#define PHY_AUTO_NEG_TIME		80	/* 8.0 Seconds */
 #define PHY_FORCE_TIME			20	/* 2.0 Seconds */
 #define PHY_REVISION_MASK		0xFFFFFFF0
 #define DEVICE_SPEED_MASK		0x00000300	/* Device Ctrl Reg Speed Mask */