video-color: Fix for missing clipping in PQ EOTF function
* Add missing clipping in EOTF * Use pre-calculated values * Update variable names to specification's defined ones Part-of: <gstreamer/gstreamer!1629>
* Add missing clipping in EOTF * Use pre-calculated values * Update variable names to specification's defined ones Part-of: <gstreamer/gstreamer!1629>