base-defaults: Add PulseAudio profile for devkit
This is a workaround for the devkit's audio not working properly with PulseAudio (linux-emcraft#19). There is no standard "front" device for the SGTL5000 codec so PulseAudio fails to probe the card properly with the default profile. We create a new profile specifically for the devkit and direct PulseAudio to use it through a udev rule.
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