Convert CONFIG_NETCONSOLE to Kconfig

This converts the following to Kconfig:
   CONFIG_NETCONSOLE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/edminiv2_defconfig b/configs/edminiv2_defconfig
index 7c9cfdd..916775e 100644
--- a/configs/edminiv2_defconfig
+++ b/configs/edminiv2_defconfig
@@ -31,6 +31,7 @@
 CONFIG_ENV_OVERWRITE=y
 CONFIG_ENV_IS_IN_FLASH=y
 CONFIG_ENV_ADDR=0xFFF84000
+CONFIG_NETCONSOLE=y
 CONFIG_MVSATA_IDE=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y