Fixes#2708 for io_uring_cmd.
This is a minimal approach to enabling polling for bdev_xnvme. Ideally,
more would be done, however, there are several blockers to remove when
doing so. Thus, this commit only enables polling on
io_mechanism=io_uring_cmd.
Signed-off-by: Simon A. F. Lund <simon.lund@samsung.com>
Change-Id: Ifa604b52bb2b924fab4b559fae06f26a3574db42
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/14679
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>