arm: imx: iim/ocotp: fix link error when !CONFIG_NET
Don't try to attach mac to device if there is no net support selected.
Fixes:
undefined reference to `dev_add_param_mac' in both iim and ocotp drivers.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>