drm/v3d: Synchronous operations can't timeout

drm/v3d: Synchronous operations can't timeout

CPU jobs and CACHE CLEAN jobs execute synchronously once the DRM
scheduler starts running them. Therefore, there is no fence to wait on,
neither are those jobs able to timeout.

Hence, remove the `timedout_job` hook from the CPU and CACHE CLEAN
scheduler ops.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Link: https://lore.kernel.org/r/20250826-v3d-queue-lock-v3-5-979efc43e490@igalia.com
Signed-off-by: Maíra Canal <mcanal@igalia.com>