drm/i915/display: Hook up intel_colorop_destroy

drm/i915/display: Hook up intel_colorop_destroy

i915 embeds struct drm_colorop inside struct intel_colorop, so the
default drm_colorop_destroy() helper cannot be used. Add an
intel_colorop_destroy() helper that performs common DRM cleanup and
frees intel_colorop object.

This ensures correct teardown of plane color pipeline objects.

Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260202094202.2871478-6-chaitanya.kumar.borah@intel.com