ucm2: USB-Audio: fix channel counts for SSL 2+ MK II

GitHub pull_request - opened <[email protected]>
Newsgroups org.alsa-project.alsa-devel
Message-ID <[email protected]>
alsa-project/alsa-ucm-conf pull request #837 was opened from lofiwatercat:

Got an SSL 2+ MK II and hit the UCM errors described in #795.

#681 added MK II support, but the author had no SSL 2+ MK II and could
not verify it. The merged regex (`USB31e9:000[29]`) therefore gives the SSL 2+ MK I the SSL 2+ MK II channel counts of 4 playback / 4 capture.

The SSL 2+ MK II actually has 6 playback and 8 capture channels, so the
config describes the device incorrectly and the card shows as
`[ALSA UCM error]`.

[alsa_info.txt](https://alsa-project.org/db/?f=a322db1c1bb51cf1ab611bbba3a5900fffc846b8)

Request URL   : https://github.com/alsa-project/alsa-ucm-conf/pull/837
Patch URL     : https://github.com/alsa-project/alsa-ucm-conf/pull/837.patch
Repository URL: https://github.com/alsa-project/alsa-ucm-conf
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