hwmon: (emc2305) add support for EMC2301/2/3/5 RPM-based PWM Fan Speed Controller.

Add driver for Microchip EMC2301/2/3/5 RPM-based PWM Fan Speed Controller.
Modify Makefile and Kconfig to support Microchip EMC2305 RPM-based
PWM Fan Speed Controller.

Signed-off-by: Michael Shych <michaelsh@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20220810171552.56417-3-michaelsh@nvidia.com


[groeck: Drop unnecessary () around DIV_ROUND_CLOSEST()]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>