drm/i915: fix checksum write for automated test reply
DP spec requires the checksum of the last block read to be written when replying to TEST_EDID_READ. This patch fixes the current code to do the same. v2: removed loop for jumping blocks and performed direct addition as recommended by Daniel Signed-off-by: NSivakumar Thulasimani <sivakumar.thulasimani@intel.com> Reviewed-by: NSonika Jindal <sonika.jindal@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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