Update compatible string for hikey960. HiKey960 is a develpment board built
with SoC Hi3660.
Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Chen Feng <puck.chen@hisilicon.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>