sfc: Fix build with CONFIG_RFS_ACCEL disabled.

   drivers/net/ethernet/sfc/ef100_nic.c:835:3: error: 'const struct efx_nic_type' has no member named 'filter_rfs_expire_one'
     835 |  .filter_rfs_expire_one = efx_mcdi_filter_rfs_expire_one,
         |   ^~~~~~~~~~~~~~~~~~~~~
>> drivers/net/ethernet/sfc/ef100_nic.c:835:27: error: initialization of 'void (*)(struct efx_nic *, u32)' {aka 'void (*)(struct efx_nic *, unsigned int)'} from incompatible pointer type 'bool (*)(struct efx_nic *, u32,  unsigned int)' {aka '_Bool (*)(struct efx_nic *, unsigned int,  unsigned int)'} [-Werror=incompatible-pointer-types]
     835 |  .filter_rfs_expire_one = efx_mcdi_filter_rfs_expire_one,
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Reported-by: Nkernel test robot <lkp@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ef100_nic.c

@@ -832,7 +832,9 @@ const struct efx_nic_type ef100_vf_nic_type = {
 	.filter_count_rx_used = efx_mcdi_filter_count_rx_used,
 	.filter_get_rx_id_limit = efx_mcdi_filter_get_rx_id_limit,
 	.filter_get_rx_ids = efx_mcdi_filter_get_rx_ids,
+#ifdef CONFIG_RFS_ACCEL
 	.filter_rfs_expire_one = efx_mcdi_filter_rfs_expire_one,
+#endif
 
 	.rx_prefix_size = ESE_GZ_RX_PKT_PREFIX_LEN,
 	.rx_hash_offset = ESF_GZ_RX_PREFIX_RSS_HASH_LBN / 8,