Per discussion in https://bugzilla.mozilla.org/show_bug.cgi?id=1197045#c22, we need to add the audio driver/hardware information to about:support.

Mass change P2->P3 to align with new Mozilla triage process.

On OSX, we could get the `device name`, `unique id`, and `firmware version` by `kAudioObjectPropertyModelName`[0], `kAudioDevicePropertyModelUID`[1], and `kAudioObjectPropertyFirmwareVersion`[2]. It would be better if we also get the transport type(e.g. USB, HDMI, PCI, AirePlay, etc.). It could be accessed by `kAudioDevicePropertyTransportType`[3]. [0] https://github.com/phracker/MacOSX-SDKs/blob/master/MacOSX10.9.sdk/System/Library/Frameworks/CoreAudio.framework/Versions/A/Headers/AudioHardwareBase.h#L267-L271 [1] https://github.com/phracker/MacOSX-SDKs/blob/master/MacOSX10.9.sdk/System/Library/Frameworks/CoreAudio.framework/Versions/A/Headers/AudioHardwareBase.h#L601-L607 [2] https://github.com/phracker/MacOSX-SDKs/blob/master/MacOSX10.9.sdk/System/Library/Frameworks/CoreAudio.framework/Versions/A/Headers/AudioHardwareBase.h#L307-L311 [3] https://github.com/phracker/MacOSX-SDKs/blob/master/MacOSX10.9.sdk/System/Library/Frameworks/CoreAudio.framework/Versions/A/Headers/AudioHardwareBase.h#L608-L611

The cubeb draft is here[0]. I'll put this on bug 1378633 when it's completed. [0] https://github.com/ChunMinChang/cubeb/compare/master...hwinfo