drm/i915: Shrink bxt_ddi_buf_trans
All the values we put into the BXT buf_trans tables fit into 8 bits. So switch over to u8 from the u32 we use currently. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20170918182604.9519-3-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
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