igc: Remove symbol error counter

Accordance to the i225 datasheet symbol error counter does not
applicable to the i225 device.
This patch comes to clean up this counter.
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_mac.c

@@ -235,7 +235,6 @@ s32 igc_force_mac_fc(struct igc_hw *hw)
 void igc_clear_hw_cntrs_base(struct igc_hw *hw)
 {
 	rd32(IGC_CRCERRS);
-	rd32(IGC_SYMERRS);
 	rd32(IGC_MPC);
 	rd32(IGC_SCC);
 	rd32(IGC_ECOL);

drivers/net/ethernet/intel/igc/igc_main.c

@@ -3701,7 +3701,6 @@ void igc_update_stats(struct igc_adapter *adapter)
 	adapter->stats.prc511 += rd32(IGC_PRC511);
 	adapter->stats.prc1023 += rd32(IGC_PRC1023);
 	adapter->stats.prc1522 += rd32(IGC_PRC1522);
-	adapter->stats.symerrs += rd32(IGC_SYMERRS);
 	adapter->stats.sec += rd32(IGC_SEC);
 
 	mpc = rd32(IGC_MPC);

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

@@ -127,7 +127,6 @@
 /* Statistics Register Descriptions */
 #define IGC_CRCERRS	0x04000  /* CRC Error Count - R/clr */
 #define IGC_ALGNERRC	0x04004  /* Alignment Error Count - R/clr */
-#define IGC_SYMERRS	0x04008  /* Symbol Error Count - R/clr */
 #define IGC_RXERRC	0x0400C  /* Receive Error Count - R/clr */
 #define IGC_MPC		0x04010  /* Missed Packet Count - R/clr */
 #define IGC_SCC		0x04014  /* Single Collision Count - R/clr */