drm/i915/dsb: Re-instate DSB for LUT updates

With all the known issues sorted out we can start to use
DSB to load the LUTs.

Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231009132204.15098-3-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/display/intel_color.c

@@ -1895,9 +1895,6 @@ void intel_color_prepare_commit(struct intel_crtc_state *crtc_state)
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
 
-	/* FIXME DSB has issues loading LUTs, disable it for now */
-	return;
-
 	if (!crtc_state->hw.active ||
 	    intel_crtc_needs_modeset(crtc_state))
 		return;