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Clean up the SPDX licence declarations to comply with checkpatch.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210122192913.4518-1-chris@chris-wilson.co.uk

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>