drm/amdkfd: Fix mode1 reset crash issue

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

drm/amdkfd: Fix mode1 reset crash issue

If HW scheduler hangs and mode1 reset is used to recover GPU, KFD signal

user space to abort the processes. After process abort exit, user queues

still use the GPU to access system memory before h/w is reset while KFD

cleanup worker free system memory and free VRAM.

There is use-after-free race bug that KFD allocate and reuse the freed

system memory, and user queue write to the same system memory to corrupt

the data structure and cause driver crash.

To fix this race, KFD cleanup worker terminate user queues, then flush

reset_domain wq to wait for any GPU ongoing reset complete, and then

free outstanding BOs.