hwmon: (emc2305) Configure PWM channels based on DT properties

Add support for configuring each PWM channel using Device Tree (DT)
properties by parsing the 'pwms' phandle arguments.

Signed-off-by: Florin Leotescu <florin.leotescu@nxp.com>
Link: https://lore.kernel.org/r/20250603113125.3175103-3-florin.leotescu@oss.nxp.com


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