drm/i915/dp: Pass .4 BPP values to {icl,xelpd}_dsc_compute_link_config()

drm/i915/dp: Pass .4 BPP values to {icl,xelpd}_dsc_compute_link_config()

Try to keep the variables in the same domain a bit longer to reduce
juggling between integers and .4 fixed point. Change parameter order to
min, max while at it.

For now, keep the juggling in dsc_compute_compressed_bpp() ensure
min/max will always have 0 fractional part. To be fixed later.

Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/e72f153fd28755e41ee8c5a7b9e6de257c3b27ac.1738327620.git.jani.nikula@intel.com