ixgbe: Move the LED blink code to common, since 82599 also uses it

The LED blink code is common for 82599 as well.  It should be moved to
ixgbe_common.c so both devices can use it, and not have it duplicated.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>