sfc: declare module version (same as ethtool drvinfo version)

Signed-off-by: NEdward Cree <ecree@solarflare.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/efx.c

@@ -3585,3 +3585,4 @@ MODULE_AUTHOR("Solarflare Communications and "
 MODULE_DESCRIPTION("Solarflare network driver");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(pci, efx_pci_table);
+MODULE_VERSION(EFX_DRIVER_VERSION);