hwmon: (emc1403) Support 11 bit accuracy

Various temperature and limit registers support 11 bit accuracy.
Add support for it.

Cc: Lars Petter Mostad <lars.petter.mostad@appear.net>
Tested-by: Lars Petter Mostad <lars.petter.mostad@appear.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>