OSHMEM: spml ikrit: disable rdmap op DCI pool

Instead use single pool for both rdma and send receive ops.
(cherry picked from commit ompi/open-mpi@e1cf6f37baf2b6240ab3aa3a219b8856cfa2caf4)
Merge pull request #131 from alex-mikheev/topic/spml_ikrit_dc_env_fix-v1.8

OSHMEM: spml ikrit: disable rdmap op DCI pool