drm/sched: Partial revert of "Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()"

drm/sched: Partial revert of "Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()"

Commit f3123c2590005c, in combination with the use of work queues by the GPU
scheduler, leads to random lock-ups of the GUI.

This is a partial revert of of commit f3123c2590005c since drm_sched_wakeup() still
needs its entity argument to pass it to drm_sched_can_queue().

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2994
Link: https://lists.freedesktop.org/archives/dri-devel/2023-November/431606.html
Signed-off-by: Bert Karwatzki <spasswolf@web.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20231127160955.87879-1-spasswolf@web.de
Link: https://lore.kernel.org/r/36bece178ff5dc705065e53d1e5e41f6db6d87e4.camel@web.de
Fixes: f3123c2590005c ("drm/sched: Qualify drm_sched_wakeup() by drm_sched_entity_is_ready()")
Reviewed-by: Luben Tuikov <ltuikov89@gmail.com>
Signed-off-by: Luben Tuikov <ltuikov89@gmail.com>