igb: Update NVM functions to work with i350 devices

This patch adds functions and functions pointers to accommodate
differences between NVM interfaces and options for i350 devices,
82580 devices and the rest.

Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/igb/igb_ethtool.c b/drivers/net/igb/igb_ethtool.c
index 78d420b..df15a91 100644
--- a/drivers/net/igb/igb_ethtool.c
+++ b/drivers/net/igb/igb_ethtool.c
@@ -721,7 +721,7 @@
 	/* Update the checksum over the first part of the EEPROM if needed
 	 * and flush shadow RAM for 82573 controllers */
 	if ((ret_val == 0) && ((first_word <= NVM_CHECKSUM_REG)))
-		igb_update_nvm_checksum(hw);
+		hw->nvm.ops.update(hw);
 
 	kfree(eeprom_buff);
 	return ret_val;