hwmon: (sht3x) complement sysfs interface for sts3x

Compared to sht3x, sts3x has the similar functions and operations
but it has no humidity sensor.

Signed-off-by: JuenKit Yip <JuenKit_Yip@hotmail.com>
Link: https://lore.kernel.org/r/DB4PR10MB6261B912ADFA6BB78240596F9258A@DB4PR10MB6261.EURPRD10.PROD.OUTLOOK.COM


Signed-off-by: Guenter Roeck <linux@roeck-us.net>