USB-Audio: Add support for the SSL 2 MK II

[GitHub pull_request - opened <github@alsa-project.org>]

alsa-project/alsa-ucm-conf pull request #681 was opened from MTRNord:

This adds support for https://solidstatelogic.com/products/ssl-2-mkii and the https://solidstatelogic.com/products/ssl-2-plus-mkii and solves #555 

The MK II shows up the same way as the SSL2, but as a different USB Device.

I only own the SSL2 MK2, but not the SSL2+ MK2. So I can only verify it for the SSL2 MK2. However, I am fairly certain that the + version likely is also behaving identically. There are no visible spec changes between the v1 and MK2 of these devices, from all I was able to tell based on the internet. So, likely only the USB ID changed (at least for the things alsa-ucm is concerened about)

Request URL   : https://github.com/alsa-project/alsa-ucm-conf/pull/681
Patch URL     : https://github.com/alsa-project/alsa-ucm-conf/pull/681.patch
Repository URL: https://github.com/alsa-project/alsa-ucm-conf