drm/amdkfd: keep BOs in system memory if restore failed

If vram is used up, display allocate vram evict the KFD BOs to system
memory. KFD schedule restore work to restore BOs back to vram. If
display BOs are pinned in vram, KFD restore work will keep retry, and
may never success.

If restore BO back to vram failed, keep the BO in system memory to
prevent endless retry restore, and GPU mapping will update to system
memory.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>