bnx2x: Fix LED behavior

This fix resolve two problems seen regarding LED:
1. LED doesn't flash during port identification.
2. Traffic LED sometimes do not blink.

Signed-off-by: Yaniv Rosner <yanivr@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>