hwmon: (pwm-fan): Make use of device properties everywhere

Commit 255ab27a ("hwmon: (pwm-fan) Introduce start from stopped state
handling") added two of_property_read_u32() calls after the driver was
reworked to use device_property_* in commit dfd977d8 ("hwmon: (pwm-fan)
Make use of device properties"), so convert those as well.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20250102170429.791912-1-peter@korsgaard.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>