Revert "drm/amdkfd: Use partial migrations in GPU page faults"

Revert "drm/amdkfd: Use partial migrations in GPU page faults"

This reverts commit dc427a473e5d119232ddb27530920d9796cdea70.

The change prevents migrating the entire range to VRAM because retry
fault restore_pages map the remaining system memory range to GPUs. It
will work correctly to submit together with partial mapping to GPU
patch later.

Signed-off-by: Philip Yang <[email protected]>
Reviewed-by: Felix Kuehling <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>