hwmon: (oxp-sensors) Use less convoluted enum cast

hwmon: (oxp-sensors) Use less convoluted enum cast

Change

  .driver_data = (void *) &(enum type) {enum_literal};

to more readable form:

  .driver_data = (void *) enum_literal;

and corresponding cast usage as board type flag.

Signed-off-by: Joaquín Ignacio Aramendía <samsagax@gmail.com>
Link: https://lore.kernel.org/r/20230429142547.328125-1-samsagax@gmail.com
[groeck: Use double cast for assignment from driver_data to fix clang build warning]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>