ppc: qemu: Enable driver model

At present QEMU ppce500 target has not been migrated to driver model
yet. As a start, let's enable driver model and the 'dm' command.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
1 file changed