ixgbe: remove linux/export.h header from ixgbe_ptp.c

We don't need this header file, so we shouldn't be including it.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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

@@ -26,7 +26,6 @@
 
 *******************************************************************************/
 #include "ixgbe.h"
-#include <linux/export.h>
 #include <linux/ptp_classify.h>
 
 /*