RDMA/bnxt_re: Update the BAR offsets

Update the BAR offsets for handling GenP7 adapters.
Use the values populated by L2 driver for getting the
Doorbell offsets.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://lore.kernel.org/r/1701946060-13931-3-git-send-email-selvin.xavier@broadcom.com


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