[FS#256] usb audio doesn't work - "no such device"

[LEDE Bugs]

The following task has a new comment added:

FS#256 - usb audio doesn't work - "no such device"
User who did this - Jo-Philipp Wich (jow-)

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And yes, the ''SOUND_PCM_TIMER'' symbol should get triggered by the ''sound-core'' module
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=256#comment766