Add `mock` to RPIO Options (#41745)
Add `mock` to RPIO Options (#41745)

Options type is missing `mock` setting from [node-rpio](https://github.com/jperkin/node-rpio#mock).
georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,mcliment/DefinitelyTyped,georgemarshall/DefinitelyTyped