Force to set pwm_config, because pwm config might be modified by someone else outside this function.
For more information, please read https://bugzilla.mozilla.org/show_bug.cgi?id=720767
Fix vibrator broken issue.
Aww I wanted to !summon @qdot
I would like to say that I /did/ totally call the cause of the issue (pwm clock issues) when it was reported on IRC. My inate vibrator sense was right! It's just like a spidey sense except... Wait this is on a public website nevermind.