sfc: Add NIC type operations to replace direct calls from efx.c into siena_sriov.c

Also add dummy functions where required to avoid NULL pointer dereference.

Signed-off-by: Shradha Shah <sshah@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 779a1f5..325dd94 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -1330,6 +1330,11 @@
 	int (*ptp_set_ts_sync_events)(struct efx_nic *efx, bool en, bool temp);
 	int (*ptp_set_ts_config)(struct efx_nic *efx,
 				 struct hwtstamp_config *init);
+	int (*sriov_init)(struct efx_nic *efx);
+	void (*sriov_fini)(struct efx_nic *efx);
+	void (*sriov_mac_address_changed)(struct efx_nic *efx);
+	bool (*sriov_wanted)(struct efx_nic *efx);
+	void (*sriov_reset)(struct efx_nic *efx);
 
 	int revision;
 	unsigned int txd_ptr_tbl_base;