e1000e: resolve -Wunused-parameter compile warnings

Remove the unused parameter when possible, otherwise use __always_unused
attribute.

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/phy.c b/drivers/net/ethernet/intel/e1000e/phy.c
index 8dd1da0..6f32811 100644
--- a/drivers/net/ethernet/intel/e1000e/phy.c
+++ b/drivers/net/ethernet/intel/e1000e/phy.c
@@ -2178,7 +2178,7 @@
  *  Generic function to wait 10 milli-seconds for configuration to complete
  *  and return success.
  **/
-s32 e1000e_get_cfg_done_generic(struct e1000_hw *hw)
+s32 e1000e_get_cfg_done_generic(struct e1000_hw __always_unused *hw)
 {
 	mdelay(10);