netdevice.h net/core/dev.c: Convert netdev_<level> logging macros to functions

Reduces an x86 defconfig text and data ~2k.
text is smaller, data is larger.

$ size vmlinux*
   text	   data	    bss	    dec	    hex	filename
7198862	 720112	1366288	9285262	 8dae8e	vmlinux
7205273	 716016	1366288	9287577	 8db799	vmlinux.device_h

Uses %pV and struct va_format
Format arguments are verified before printk

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
 static void __net_exit netdev_exit(struct net *net)
 {
 	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}

 static void __net_exit netdev_exit(struct net *net)
 {
 	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}
