usb-audio

Change-Id: Id29d9594d9ba76167e5933487862eff4a8875a6d
USB AUDIO as secondary sound device

Change-Id: I883f21a1bedc416fc8d192050cdfb5c2232dc084
disabled dac as secondary

Change-Id: Iccb49e9175dc98d5a0bf5105cc2ffba119343fd6
configs: Update to V9. Also trying out USB DAC patches from @mehrvarz repo.