drm/amdkfd: don't always call execute_queues_cpsch()

When destroying an inactive queue, we don't need to call
execute_queues_cpsch.

Signed-off-by: Yong Zhao <yong.zhao@amd.com>
Reviewed-by: Oak Zeng <oak.zeng@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>