RDMA/bnxt_re: Disable doorbell moderation if hardware register read fails

If the HW register read fails, the FIFO will be always shown as
full. DB moderation doesn't work in that case and the traffic fails.
So disable this feature and log a message.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://lore.kernel.org/r/1719456065-27394-4-git-send-email-selvin.xavier@broadcom.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>