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Abstract bitrate calculation to a newly resurrected intel_dsi.c file that will contain common code for VLV and ICL DSI. No functional changes. Cc: Madhav Chauhan <madhav.chauhan@intel.com> Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Reviewed-by: Madhav Chauhan <madhav.chauhan@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/100e9721dfdec4f3987549ef24291bafc9cb0517.1539613303.git.jani.nikula@intel.com