qlge: Add support for lost firmware events.

When the firmware is issuing events to the driver the events
must be removed from the queue.  If the queue overflows, the
firmware will build and special event that captures those that
are lost.

Signed-off-by: Ron Mercer <ron.mercer@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>