igc: Clean up obsolete NVM defines

Packet buffer allocation, reserved word and pointer guard
not applicable for i225 parts.
This patch comes to clean up these obsolete defines
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

@@ -163,11 +163,6 @@
 
 /* For checksumming, the sum of all words in the NVM should equal 0xBABA. */
 #define NVM_SUM				0xBABA
-
-#define NVM_PBA_OFFSET_0		8
-#define NVM_PBA_OFFSET_1		9
-#define NVM_RESERVED_WORD		0xFFFF
-#define NVM_PBA_PTR_GUARD		0xFAFA
 #define NVM_WORD_SIZE_BASE_SHIFT	6
 
 /* Collision related configuration parameters */