igc: Remove unneeded PCI bus defines

PCIe device control 2 defines does not use internally.
This patch comes to clean up 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_defines.h

@@ -10,10 +10,6 @@
 
 #define IGC_CTRL_EXT_DRV_LOAD	0x10000000 /* Drv loaded bit for FW */
 
-/* PCI Bus Info */
-#define PCIE_DEVICE_CONTROL2		0x28
-#define PCIE_DEVICE_CONTROL2_16ms	0x0005
-
 /* Physical Func Reset Done Indication */
 #define IGC_CTRL_EXT_LINK_MODE_MASK	0x00C00000