drm/sched: use DECLARE_EVENT_CLASS

drm_sched_job and drm_run_job have the same prototype.

v2: rename the class from drm_sched_job_entity to drm_sched_job (Andrey)

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Cc: Rob Clark <robdclark@chromium.org>
Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220412204809.824491-1-olvaffe@gmail.com