drm/i915: Pass the crtc to the low level read_lut() funcs
The low level read_lut() functions don't need the entire crtc state as they know exactly what they're reading. Just need to pass in the crtc to get at the pipe. This now neatly mirrors the load_lut() direction. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200303173313.28117-10-ville.syrjala@linux.intel.comReviewed-by: NSwati Sharma <swati2.sharma@intel.com>
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