[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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The runtime memory usage is not that interesting, we need to know whether the vmlinux image in ''build_dir/target-mipsel_24kc_musl-1.1.15/linux-ramips_mt7620/linux-4.4.30/vmlinux'' changes its file size significantly before and after ''CONFIG_SND_PCM_TIMER'' being enabled.
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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#comment764