drm: Add explicit acquire ctx handling around ->set_config
Just the groundwork to have something to feed into ->set_config. Again we need a temporary hack to still fill out the legacy ctx in mode_config.acquire_ctx. Reviewed-by: Harry Wentland <harry.wentland@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20170322215058.8671-18-daniel.vetter@ffwll.ch
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