hwmon: (lm75) Create structure to save all the configuration parameters.

hwmon: (lm75) Create structure to save all the configuration parameters.

* Add to lm75_data kind field to store the kind of device the driver is
  working with.
* Add an structure to store the configuration parameters of all the
  supported devices.
* Delete resolution_limits from lm75_data and include them in the structure
  described above.
* Add a pointer to the configuration parameters structure to be used as a
  reference to obtain the parameters.
* Delete switch-case approach to get the device configuration parameters.
* The structure is cleaner and easier to maintain.

Signed-off-by: Iker Perez del Palomar Sustatxa <iker.perez@codethink.co.uk>
Link: https://lore.kernel.org/r/20190808080246.8371-2-iker.perez@codethink.co.uk
Signed-off-by: Guenter Roeck <linux@roeck-us.net>