net: core: move mac_pton() to lib/net_utils.c

Since we have at least one user of this function outside of CONFIG_NET
scope, we have to provide this function independently. The proposed
solution is to move it under lib/net_utils.c with corresponding
configuration variable and select wherever it is needed.

Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/if_ether.h

@@ -30,7 +30,6 @@ static inline struct ethhdr *eth_hdr(const struct sk_buff *skb)
 
 int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
 
-int mac_pton(const char *s, u8 *mac);
 extern ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len);
 
 #endif	/* _LINUX_IF_ETHER_H */