arm64: dts: Register Hi3660's thermal sensor

Add binding for tsensor on H3660, this tsensor is used for
SoC thermal control, it supports alarm interrupt.

Signed-off-by: Kevin Wangtao <kevin.wangtao@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>