drm/i915: Nuke the useless changed param from skl_ddb_add_affected_pipes()

changed==true just means we have some crtcs in the state. All the
stuff following this only operates on crtcs in the state anyway so
there is no point in having this bool.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191011200949.7839-2-ville.syrjala@linux.intel.com


Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>