add support duty config

[heartacker]

Please describe your system environment before submitting your Issue.

justtlike the phase below. {"name": "GPIO4_CLK", "wave" :"l.P.............l", "phase":0.4} , --> {"name": "GPIO4_CLK", "wave" :"l.P.............l", "phase":0.4,"duty":0.4} ,

after that, we could adjust the duty of the clock.