hwmon: (shtc1) Fix property misspelling

The property name is "sensirion,low-precision", not
"sensicon,low-precision".

Cc: Chris Ruehl <chris.ruehl@gtsys.com.hk>
Fixes: be7373b6 ("hwmon: shtc1: add support for device tree bindings")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>