hwmon: (pc87360) Reorder symbols to get rid of a few forward declarations

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

Reorder the functions and variables to get rid of 6 forward declarations.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220919103155.795151-3-u.kleine-koenig@pengutronix.deSigned-off-by: Guenter Roeck <linux@roeck-us.net>