Add RADEON_CS ioctl support for r600 and r700.

This is a faked up version of the gem command submission method for r600
required for OpenGL support on these chipsets.

Currently support is not perfect. since these chips have a rather funky
ringbuffer based interrupt method which this code does not yet support so
interrupt based polling methods must be turned off in mesa.

I've not found a good way which to do that per-driver, so until I work
that out I the following .drirc (or /etc/drirc) chunk (provided by
Brynet after I was too slack to provide it myself) will be needed:

<driconf>
        <device screen="0" driver="r600">
                <application name="all">
                        <option name="fthrottle_mode" value="0"/>
                        <option name="vblank_mode" value="0"/>
                </application>
        </device>
</driconf>


Tested by many on tech@. While it provided more problems, this diff made
espie@ stop nagging me when he finally found out it existed.

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