igc: Remove unused definition

Remove the unused IGC_FUNC_0 definition and make the code cleaner
Signed-off-by: NSasha Neftin <sasha.neftin@intel.com>
Tested-by: NAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

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

@@ -22,8 +22,6 @@
 #define IGC_DEV_ID_I220_V			0x15F7
 #define IGC_DEV_ID_I225_K			0x3100
 
-#define IGC_FUNC_0				0
-
 /* Function pointers for the MAC. */
 struct igc_mac_operations {
 	s32 (*check_for_link)(struct igc_hw *hw);