agp: kill agp_(unmap|map)_memory
DMA remapping was only used by the intel-gtt driver. With that code now folded into the driver, kill the agp generic support for it. Cc: Dave Airlie <airlied@linux.ie> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
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