drm/radeon/kms: rs400/480 MC setup is different than r300.
Boot testing on my rs480 laptop found the MC idle never happened on startup, a quick check with AMD found the idle bit is in a different place on the rs4xx than r300. Implement a new rs400 mc idle function to fix this. Signed-off-by: Dave Airlie <firstname.lastname@example.org>
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