RDMA/bnxt_re: Fix the table size for PSN/MSN entries

RDMA/bnxt_re: Fix the table size for PSN/MSN entries

HW MSN table size is always a power of 2. So the pages should be mapped
accordingly.

Use the power of two calculation while get the number of PSN/MSN entries.

Fixes: 6f6bfbc595fb ("RDMA/bnxt_re: Expose the MSN table capability for user library")
Link: https://patch.msgid.link/r/1724042847-1481-4-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>