drm/i915/dp: Fix colorimetry detection

drm/i915/dp: Fix colorimetry detection

intel_dp_init_connector() is no place for detecting stuff via
DPCD (except perhaps for eDP). Move the colorimetry stuff into
a more appropriate place.

Cc: Jouni Högander <jouni.hogander@intel.com>
Fixes: 00076671a648 ("drm/i915/display: Move colorimetry_support from intel_psr to intel_dp")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240918190441.29071-1-ville.syrjala@linux.intel.com
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>