Add PCIe node for hi3660

Cc: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Xiaowei Song <songxiaowei@hisilicon.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

Changes in v5:
 * fix interrupt-map, to conform to gic's #address-cells = <0>
 * remove redundant status = "ok"
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>