drm/i915: Simplify the intel_color_init_hooks() if ladder

Get rid of the funny hsw vs. ivb extra indentation level in
intel_color_init_hooks().

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220929071521.26612-4-ville.syrjala@linux.intel.com


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