drm/i915: Plumb the full atomic state into skl_ddb_add_affected_planes()

drm/i915: Plumb the full atomic state into skl_ddb_add_affected_planes()

skl_ddb_add_affected_planes() needs the full atomic state. Instead
of digging that out from dubious sources plumb it in explicitly.

The wm counterpart (skl_wm_add_affected_planes()) already does
things in the proper way.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240528184945.24083-3-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>