e1000e: implement ethtool set_phys_id

Based on a patch from Stephen Hemminger <shemminger@vyatta.com>.

The new ethtool set_phys_id takes over controlling the LED for
identifying boards.  This fixes the lockout during that period.
For this device lots of extra infrastructure can also be removed by
using set_phys_id.

v2: - return blink frequency for parts that do not support blink in h/w
    - add blink_led function pointers for devices that do support blink
      in h/w to cleanup the test for this functionality

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Cc: Stephen Hemminger <shemminger@vyatta.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/e1000e/hw.h b/drivers/net/e1000e/hw.h
index 307e1ec..6c2fa83 100644
--- a/drivers/net/e1000e/hw.h
+++ b/drivers/net/e1000e/hw.h
@@ -756,6 +756,7 @@
 /* Function pointers and static data for the MAC. */
 struct e1000_mac_operations {
 	s32  (*id_led_init)(struct e1000_hw *);
+	s32  (*blink_led)(struct e1000_hw *);
 	bool (*check_mng_mode)(struct e1000_hw *);
 	s32  (*check_for_link)(struct e1000_hw *);
 	s32  (*cleanup_led)(struct e1000_hw *);