hwmon: (f71882fg) Reorder symbols to get rid of a few forward declarations

Declarations for static symbols are useless code repetition (unless
there are cyclic dependencies).

Reorder some functions and variables which allows to get rid of 42
forward declarations.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>