drm/i915/cdclk: Relocate intel_plane_calc_min_cdclk() calls

drm/i915/cdclk: Relocate intel_plane_calc_min_cdclk() calls

There's no reason to defer intel_plane_calc_min_cdclk() until
intel_cdclk_atomic_check(). Just do this as part of
intel_atomic_check_planes() (after we've added all the planes to
the state that affect the per-plane min_cdclk calculation).

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250923171943.7319-14-ville.syrjala@linux.intel.com
Reviewed-by: Mika Kahola <mika.kahola@intel.com>