RDMA/bnxt_re: Remove non-statistics counters from hw_counters

Remove non-statistics counters from the RDMA hw_counters framework.
The removed data includes:

- Active resource counts (ACTIVE_PD, ACTIVE_QP, etc.)
- Resource watermarks (WATERMARK_PD, WATERMARK_QP, etc.)
- Operational counters (RESIZE_CQ_CNT)
- DB pacing metrics (PACING_RESCHED, PACING_CMPL, etc.)

This change ensures hw_counters contains only true performance
and error statistics.

Link: https://patch.msgid.link/r/20250923062657.981487-3-kalesh-anakkur.purayil@broadcom.com


Signed-off-by: Anantha Prabhu <anantha.prabhu@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>