ixgbe: remove duplicate netif_tx_start_all_queues

netif_tx_start_all_queues() is already called in ixgbe_up_complete, no need
to do it twice.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>