i40e: removed no longer needed delays

Removed no longer needed delays.  At preproduction stage those delays were
needed but now these delays are not needed.
Signed-off-by: NBimmy Pujari <bimmy.pujari@intel.com>
Tested-by: NAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -4101,8 +4101,6 @@ static int i40e_vsi_control_tx(struct i40e_vsi *vsi, bool enable)
 		}
 	}
 
-	if (hw->revision_id == 0)
-		mdelay(50);
 	return ret;
 }