pcmcia: hide the MAC address helpers if !NET

pcmcia_get_mac_from_cis is only called from networking and
recent changes made it call dev_addr_mod() which is itself
only defined if NET.
Reported-by: Nkernel test robot <lkp@intel.com>
Fixes: adeef3e3 ("net: constify netdev->dev_addr")
Signed-off-by: NJakub Kicinski <kuba@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/pcmcia/pcmcia_cis.c

@@ -386,7 +386,7 @@ size_t pcmcia_get_tuple(struct pcmcia_device *p_dev, cisdata_t code,
 }
 EXPORT_SYMBOL(pcmcia_get_tuple);
 
-
+#ifdef CONFIG_NET
 /*
  * pcmcia_do_get_mac() - internal helper for pcmcia_get_mac_from_cis()
  *
@@ -431,3 +431,4 @@ int pcmcia_get_mac_from_cis(struct pcmcia_device *p_dev, struct net_device *dev)
 }
 EXPORT_SYMBOL(pcmcia_get_mac_from_cis);
 
+#endif /* CONFIG_NET */