RapidIO support: core

Adds a RapidIO subsystem to the kernel. RIO is a switched
fabric interconnect used in higher-end embedded applications.
The curious can look at the specs over at http://www.rapidio.org

The core code implements enumeration/discovery, management of
devices/resources, and interfaces for RIO drivers.

There's a lot more to do to take advantages of all the hardware
features. However, this should provide a good base for folks
with RIO hardware to start contributing.

Signed-off-by: Matt Porter <mporter@kernel.crashing.org>

Patch is 108KB and can be found here:
ftp://source.mvista.com/pub/rio/l26_rio_core.patch

-Matt