drm/radeon: add a way to get and set initial buffer domains v2
When passing buffers between processes, the receiving process needs to know the original buffer domain, so that it doesn't accidentally move the buffer. v2: reserve the buffer Signed-off-by: NMarek Olšák <marek.olsak@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com>
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