ixgbe: Check for setup_internal_link method

Only call the internal_setup_link method when it is provided. This
check is required for newer version parts.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Darin Miller <darin.j.miller@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c

@@ -1617,7 +1617,7 @@ static s32 ixgbe_handle_lasi_ext_t_x550em(struct ixgbe_hw *hw)
 	if (status)
 		return status;
 
-	if (lsc)
+	if (lsc && phy->ops.setup_internal_link)
 		return phy->ops.setup_internal_link(hw);
 
 	return 0;