igc: Clean up unused pointers

Few function pointers from phy_operations structure were unused.
This patch cleans those.
Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/igc/igc_hw.h

@@ -114,11 +114,8 @@ struct igc_nvm_operations {
 
 struct igc_phy_operations {
 	s32 (*acquire)(struct igc_hw *hw);
-	s32 (*check_polarity)(struct igc_hw *hw);
 	s32 (*check_reset_block)(struct igc_hw *hw);
 	s32 (*force_speed_duplex)(struct igc_hw *hw);
-	s32 (*get_cfg_done)(struct igc_hw *hw);
-	s32 (*get_cable_length)(struct igc_hw *hw);
 	s32 (*get_phy_info)(struct igc_hw *hw);
 	s32 (*read_reg)(struct igc_hw *hw, u32 address, u16 *data);
 	void (*release)(struct igc_hw *hw);