microblaze: Move CONFIG_NETCONSOLE to Kconfig

Cleanup board file.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/microblaze-generic_defconfig b/configs/microblaze-generic_defconfig
index e8146ee..f30e9c1 100644
--- a/configs/microblaze-generic_defconfig
+++ b/configs/microblaze-generic_defconfig
@@ -15,6 +15,7 @@
 CONFIG_CMD_PING=y
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_OF_EMBED=y
+CONFIG_NETCONSOLE=y
 CONFIG_DM_ETH=y
 CONFIG_XILINX_AXIEMAC=y
 CONFIG_XILINX_EMACLITE=y