[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 - Dmitry (f3flight)

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Mathias, the patch works. Btw I did the change a bit differently since the flag does not have "m" option:

diff --git a/package/kernel/linux/modules/sound.mk b/package/kernel/linux/modules/sound.mk
index 1a2d4f6..04eeac3 100644
--- a/package/kernel/linux/modules/sound.mk
+++ b/package/kernel/linux/modules/sound.mk
@@ -49,6 +49,7 @@ define KernelPackage/sound-core
        CONFIG_SND_RAWMIDI \
        CONFIG_SND_TIMER \
        CONFIG_SND_PCM \
+        CONFIG_SND_PCM_TIMER \
        CONFIG_SND_SEQUENCER \
        CONFIG_SND_VIRMIDI \
        CONFIG_SND_SEQ_DUMMY \

For some reason I've lost my wlan0 after reflash but that shouldn't be related :)

I believe the fix is ok to merge into trunk.
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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#comment778