Add support for multiple PWM devices
Add support for multiple PWM devices

This code is untested. It allows the user to register and to control multiple devices attached to the PWM/Server Hat.

thelonious/g2x,gizmo-cda/g2x,gizmo-cda/g2x,gizmo-cda/g2x,gizmo-cda/g2x,thelonious/g2x