ARM: imx: Increase PHY auto-negotiation timeout to 20s on MX8Menlo

The ethernet PHY on MX8Menlo board 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 <marex@denx.de>
diff --git a/include/configs/imx8mm-mx8menlo.h b/include/configs/imx8mm-mx8menlo.h
index a86bd76..5cc60af 100644
--- a/include/configs/imx8mm-mx8menlo.h
+++ b/include/configs/imx8mm-mx8menlo.h
@@ -8,6 +8,9 @@
 
 #include <configs/verdin-imx8mm.h>
 
+/* PHY needs a longer autoneg timeout */
+#define PHY_ANEG_TIMEOUT		20000
+
 /* Custom initial environment variables */
 #undef CFG_EXTRA_ENV_SETTINGS
 #define CFG_EXTRA_ENV_SETTINGS					\