thermal/drivers/hisi: Add support for hi3660 SoC

This patch adds the support for thermal sensor on the Hi3660 SoC.
Hi3660 tsensor support alarm in alarm threshold, it also has a configurable
hysteresis interval, interrupt will be triggered when temperature rise above
the alarm threshold or fall below the hysteresis threshold.

Signed-off-by: Kevin Wangtao <kevin.wangtao@linaro.org>
Tested-by: Daniel Lezcano <daniel.lezcano@linaro.org> # hikey6220
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>