igep00x0: enable CONFIG_NET_RANDOM_ETHADDR

Enable CONFIG_NET_RANDOM_ETHADDR to generate a random MAC address
when ETHADDR is not set.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/configs/igep0020_defconfig b/configs/igep0020_defconfig
index b9e6711..a96c130 100644
--- a/configs/igep0020_defconfig
+++ b/configs/igep0020_defconfig
@@ -8,3 +8,4 @@
 CONFIG_CMD_GPIO=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_SYS_NS16550=y
+CONFIG_NET_RANDOM_ETHADDR=y