nfp: prefix vNIC phys_port_name with 'n'

Some drivers are using a bare number inside phys_port_name
as VF id and OpenStack's regexps will pick it up.  We can't
use a bare number for your vNICs, prefix the names with 'n'.
Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

@@ -3289,7 +3289,7 @@ nfp_net_get_phys_port_name(struct net_device *netdev, char *name, size_t len)
 	if (nn->dp.is_vf)
 		return -EOPNOTSUPP;
 
-	n = snprintf(name, len, "%d", nn->id);
+	n = snprintf(name, len, "n%d", nn->id);
 	if (n >= len)
 		return -EINVAL;