net/fm10k: Avoid double setting of NETIF_F_SG for the HW encapsulation feature mask

The networking core does it for the driver during registration time.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Acked-by: Matthew Vick <matthew.vick@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>