igc: Add 'igc_ethtool_' prefix to functions in igc_ethtool.c

This patch adds the prefix 'igc_ethtool_' to all functions defined in
igc_ethtool.c so they align with the name convention already followed by
other parts of the driver (e.g. igc_tsn, igc_ptp). Also, this avoids
some name clashing with functions added to igc_main.c by upcoming
patches in this series. No functionality is changed by this patch, just
function renaming.
Signed-off-by: Andre Guedes <andre.guedes@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.h

@@ -16,8 +16,7 @@
 
 #include "igc_hw.h"
 
-/* forward declaration */
-void igc_set_ethtool_ops(struct net_device *);
+void igc_ethtool_set_ops(struct net_device *);
 
 /* Transmit and receive queues */
 #define IGC_MAX_RX_QUEUES		4

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

@@ -4932,7 +4932,7 @@ static int igc_probe(struct pci_dev *pdev,
 	hw->hw_addr = adapter->io_addr;
 
 	netdev->netdev_ops = &igc_netdev_ops;
-	igc_set_ethtool_ops(netdev);
+	igc_ethtool_set_ops(netdev);
 	netdev->watchdog_timeo = 5 * HZ;
 
 	netdev->mem_start = pci_resource_start(pdev, 0);