igb: fix PHY config access on 82580
82580 NICs can have up to 4 functions. This fixes phy accesses to use the correct locks for functions 2 and 3. Signed-off-by: NNicholas Nunley <nicholasx.d.nunley@intel.com> Tested-by: NJeff Pieper <jeffrey.e.pieper@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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