e1000: Silence sparse warnings by correcting type

e1000: Silence sparse warnings by correcting type

Silence sparse warnings shown below:
...
drivers/net/e1000/e1000_main.c:3435:17: warning:
	cast to restricted __le64
drivers/net/e1000/e1000_main.c:3435:17: warning:
	cast to restricted __le64
...

(cherry picked from commit dd7f5c9e5cb24f72140206d3e5961b4cc5a84034)
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Joe Jin <joe.jin@oracle.com>