rds: remove the _reuse_ rds ib pool statistics

rds: remove the _reuse_ rds ib pool statistics

Orabug: 22124214
fix a regress introduced by ceb99ba579a769f4e02375a3d52e36f44ae5f27f

The above commit introduced the two new statistics to rds_ib_statistics.

       uint64_t        s_ib_rdma_mr_1m_pool_reuse;
       uint64_t        s_ib_rdma_mr_8k_pool_reuse;

But didn't have rds-info changed accordingly thus rds-info gets shifted stats.

this removes these two stats.

Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Acked-by: Ajaykumar Hotchandani <ajaykumar.hotchandani@oracle.com>
Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>