igb: clean up code for setting MAC address
Drop a bunch of hand written byte swapping code in favor of just doing the byte swapping ourselves. The registers are little endian registers storing a big endian value so if we read the MAC address array as little endian then we will get the CPU registers into the proper layout. Signed-off-by: NAlexander Duyck <aduyck@mirantis.com> Tested-by: NAaron Brown <aaron.f.brown@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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