drm/i915: don't rely on previous values when setting LPT TRANSCONF
Because we already set all the bits we can set. Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> [danvet: apply by hand due to dropped patch. Also, obey my OCD a bit and do a s/_TRANSACONF/TRANSCONF(TRANSCODER_A)/, makes it more consisten with other lpt pch code imnsho ...] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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