drm/nouveau/mc: allow calling of multiple handlers for a give intr bit

	struct nouveau_mc *pmc = nouveau_mc(subdev);

	const struct nouveau_mc_intr *map = pmc->intr_map;

	struct nouveau_subdev *unit;

	u32 stat;

	u32 stat, intr;

	stat = nv_rd32(pmc, 0x000100);

	intr = stat = nv_rd32(pmc, 0x000100);

	while (stat && map->stat) {

		if (stat & map->stat) {

			unit = nouveau_subdev(subdev, map->unit);

			if (unit && unit->intr)

				unit->intr(unit);

			stat &= ~map->stat;

			intr &= ~map->stat;

		}

		map++;

	}

	if (stat) {

	if (intr) {

		nv_error(pmc, "unknown intr 0x%08x\n", stat);

	}

}