bnx2x: Update firmware to 6.2.9

To fix bugs when running offloaded FCoE/iSCSI traffic in multiple
Class of Service environments.  In some scenarios, traffic could stop
on certain rings and eventually all traffic would stop.

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>