net: fix xdp_rxq_info build issue when CONFIG_SYSFS is not set

The commit e817f856 ("xdp: generic XDP handling of xdp_rxq_info")
removed some ifdef CONFIG_SYSFS in net/core/dev.c, but forgot to
remove the corresponding ifdef's in include/linux/netdevice.h.

Fixes: e817f856 ("xdp: generic XDP handling of xdp_rxq_info")
Reported-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NJesper Dangaard Brouer <brouer@redhat.com>
Tested-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -1805,12 +1805,9 @@ struct net_device {
 	/* Interface address info used in eth_type_trans() */
 	unsigned char		*dev_addr;
 
-#ifdef CONFIG_SYSFS
 	struct netdev_rx_queue	*_rx;
-
 	unsigned int		num_rx_queues;
 	unsigned int		real_num_rx_queues;
-#endif
 
 	struct bpf_prog __rcu	*xdp_prog;
 	unsigned long		gro_flush_timeout;