bnxt_re: Update the debug counters for doorbell pacing

Add debug counters to track the Doorbell pacing events and report the
doorbell pacing debug stats.

Signed-off-by: Chandramohan Akula <chandramohan.akula@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://lore.kernel.org/r/1690383081-15033-5-git-send-email-selvin.xavier@broadcom.com


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