drm: mark context support as a legacy subsystem
So after a lot of digging around in git histories it looks like this has only ever be used by dri1 render clients. Hence we can fully disable the entire thing for modesetting drivers and so greatly reduce the attack surface for potential exploits (or at least tools like trinity ...). Also add the drm_legacy prefix for functions which are called from common code. To further reduce the impact on common code also extract all the ctx release handling into a function (instead of only releasing individual handles) and make ctxbitmap_cleanup return void - it can never fail. Reviewed-by: NEric Anholt <eric@anholt.net> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: NDave Airlie <airlied@redhat.com>
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