The following adds local bus, flash and MTD partition nodes for
sbc8548. As well, a compatible field for the soc node, so that
of_platform_bus_probe() will pick it up.

Something that is provided through this newly added epld node
is the Hardware Revision which is now being utilized.
Signed-off-by: NJeremy McNicoll <jeremy.mcnicoll@windriver.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>