powerpc/85xx: Added 36-bit physical device tree for mpc8536ds board

Added a device tree that should be similiar to mpc8536ds.dtb except
the physical addresses for all IO are above the 4G boundary.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>