ARM: rmobile: Increase PHY auto-negotiation timeout to 20s

The ethernet PHY on all known Gen3 boards takes a while to come out
of reset, increase the auto-negotiation timeout to prevent it from
timing out in case the ethernet is used right after the board was
reset.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/include/configs/rcar-gen3-common.h b/include/configs/rcar-gen3-common.h
index 8f400ba..cf4d3ba 100644
--- a/include/configs/rcar-gen3-common.h
+++ b/include/configs/rcar-gen3-common.h
@@ -34,6 +34,9 @@
 #define CONFIG_SYS_MAXARGS		64
 #define CONFIG_SYS_BAUDRATE_TABLE	{ 115200, 38400 }
 
+/* PHY needs a longer autoneg timeout */
+#define PHY_ANEG_TIMEOUT		20000
+
 /* MEMORY */
 #define CONFIG_SYS_INIT_SP_ADDR		CONFIG_SYS_TEXT_BASE