hwmon: (cros_ec) register thermal sensors to thermal framework

cros_ec hwmon driver probes available thermal sensors when probing the
driver.  Register these thermal sensors to the thermal framework as well
via setting HWMON_C_REGISTER_TZ as a chip info, such that thermal
framework can adopt these sensors as well.

To make cros_ec registrable to thermal framework, the cros_ec dts need
the corresponding changes:

&cros_ec {
	#thermal-sensor-cells = <1>;
};

Signed-off-by: Sung-Chi, Li <lschyi@chromium.org>
Message-ID: <20241113024000.3327161-1-lschyi@chromium.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>