igc_set_spd_dplx method is not used. This patch comes to tidy up
the driver code.
Reported-by: NMuhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>
Signed-off-by: NSasha Neftin <sasha.neftin@intel.com>
Tested-by: NNaama Meir <naamax.meir@linux.intel.com>
Signed-off-by: NTony Nguyen <anthony.l.nguyen@intel.com>