drm/sched: Remove optimization that causes hang when killing dependent jobs

When application A submits jobs and application B submits a job with a
dependency on A's fence, the normal flow wakes up the scheduler after
processing each job. However, the optimization in
drm_sched_entity_add_dependency_cb() uses a callback that only clears
dependencies without waking up the scheduler.

When application A is killed before its jobs can run, the callback gets
triggered but only clears the dependency without waking up the scheduler,
causing the scheduler to enter sleep state and application B to hang.

Remove the optimization by deleting drm_sched_entity_clear_dep() and its
usage, ensuring the scheduler is always woken up when dependencies are
cleared.

Fixes: 777dbd458c89 ("drm/amdgpu: drop a dummy wakeup scheduler")
Cc: [email protected] # v4.6+
Signed-off-by: Lin.Cao <[email protected]>
Reviewed-by: Christian König <[email protected]>
Signed-off-by: Philipp Stanner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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