igb: remove redundant PHY power down register write
One of the registers used to power down the PHY was found to be wrong (should be bit 2 not bit 1) on further inspection it was also found to be redundant. Signed-off-by: NTodd Fujinaka <todd.fujinaka@intel.com> Tested-by: NAaron Brown <aaron.f.brown@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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