RDMA/rxe: Don't call direct between tasks

Replace calls to rxe_run_task() with rxe_sched_task().  This prevents the
tasks from all running on the same cpu.

This change slightly reduces performance for single qp send and write
benchmarks in loopback mode but greatly improves the performance with
multiple qps because if run task is used all the work tends to be
performed on one cpu. For actual on the wire benchmarks there is no
noticeable performance change.

Link: https://lore.kernel.org/r/20240329145513.35381-11-rpearsonhpe@gmail.com


Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>