Add compatible string for HiSilicon Hi6421v530 PMIC.
Signed-off-by: NGuodong Xu <guodong.xu@linaro.org>
Acked-by: NLee Jones <lee.jones@linaro.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NWei Xu <xuwei5@hisilicon.com>