drm/v3d: Add job to pending list if the reset was skipped

In the Linux kernel, the following vulnerability has been resolved:

drm/v3d: Add job to pending list if the reset was skipped

When a CL/CSD job times out, we check if the GPU has made any progress

since the last timeout. If so, instead of resetting the hardware, we skip

the reset and let the timer get rearmed. This gives long-running jobs a

chance to complete.

However, when `timedout_job()` is called, the job in question is removed

from the pending list, which means it won't be automatically freed through

`free_job()`. Consequently, when we skip the reset and keep the job

running, the job won't be freed when it finally completes.

This situation leads to a memory leak, as exposed in [1] and [2].

Similarly to commit 704d3d60fec4 ("drm/etnaviv: don't block scheduler when

GPU is still active"), this patch ensures the job is put back on the

pending list when extending the timeout.