Use the device property APIs so the driver does not depend on OF to
work.

While at it, properly include mod_devicetable for struct of_device_id
and fix some parameter alignment in the changed places.
Signed-off-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20240726-dev-hwmon-ltc6947-fw-agnostic-v1-1-f7d6cab7d438@analog.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>