drm/i915: Replace hand rolled bxt vco calculation with chv_calc_dpll_params()

Use chv_calc_dpll_params() to calculate the BXT DP DPLL VCO
frequency.

We need to add the m1 divider into bxt_dp_clk_val[] for this to work.

v2: Make the WARN_ON() sensible

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220307233940.4161-7-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>