e1000e: rename e1000e_config_collision_dist() and call as function pointer

Rename e1000e_config_collision_dist() to
e1000e_config_collision_dist_generic() to signify the function is used for
more than one MAC-family type, and set and use it as a MAC ops function
pointer to be consistent with the driver design.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c
index 1436682..df91c42 100644
--- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
+++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
@@ -746,7 +746,7 @@
 	 * of MAC speed/duplex configuration.  So we only need to
 	 * configure Collision Distance in the MAC.
 	 */
-	e1000e_config_collision_dist(hw);
+	mac->ops.config_collision_dist(hw);
 
 	/*
 	 * Configure Flow Control now that Auto-Neg has completed.
@@ -4022,6 +4022,7 @@
 	.setup_link		= e1000_setup_link_ich8lan,
 	.setup_physical_interface= e1000_setup_copper_link_ich8lan,
 	/* id_led_init dependent on mac type */
+	.config_collision_dist	= e1000e_config_collision_dist_generic,
 };
 
 static const struct e1000_phy_operations ich8_phy_ops = {