Radeon MC setup cleanup

[Benjamin Herrenschmidt]

On Sun, 2008-03-02 at 14:12 -0500, Alex Deucher wrote:
> 
> I committed a variation on this patch:
> 
> - don't need to restore memmap on each mode set
> - don't need two copies of the mc regs stored in the driver

If you removed the setting of the memmap on non-DRI cases, you probably
just broke a whole bunch of machines who will blow up as soon as 2D is
used due to a crap memory map set by the firmware.

Ben.