cnic: Add timeout for ramrod replies.

If the bnx2x device has encountered parity errors, the chip will not DMA
any replies.  Using wait_event_timeout() will allow us to make forward
progress and let bnx2x reset the chip.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>