RDMA/bnxt_re: Doorbell changes

Update the Doorbell routines to support the latest HW
definitions. Use common routine to prepare the Doorbell
key.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://lore.kernel.org/r/1701946060-13931-6-git-send-email-selvin.xavier@broadcom.com


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