It's useful to know the maximum types of sensor supported by hwmon
framework. It can be used to allocate some data structures when sorting
the monitors based on their type.

This will be used by scmi hwmon support.

Cc: linux-hwmon@vger.kernel.org
Acked-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NSudeep Holla <sudeep.holla@arm.com>