drm/amdkfd: handle CPU fault on COW mapping

[ Upstream commit e1f84eef

 ]

If CPU page fault in a page with zone_device_data svm_bo from another
process, that means it is COW mapping in the child process and the
range is migrated to VRAM by parent process. Migrate the parent
process range back to system memory to recover the CPU page fault.

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>
Stable-dep-of: 5b994354

 ("drm/amdkfd: Fix NULL pointer dereference in svm_migrate_to_ram()")
Signed-off-by: Sasha Levin <sashal@kernel.org>