4a-softmixer: bump to latest version

4a-softmixer: bump to latest version

Adds new dependencies in the recipe, and
brings all these commits:

* 943f34b loops/avirt: forget saved loops after creation
* d31ba24 Revert "avirt: restore the avirt submodule"
* 7e3e4db avirt: restore the avirt submodule
* 419c8f3 plug route: added a calculation for the number of physical channels
* a9408d3 streams: improved log output
* 396da16 core-pcm: fixed channels setting issues
* c9fb698 core pcm: use the same model for writing and reading audio
* 297aa83 pcm plugs: rework the alsa config cleanup
* c0c670a alsa-api-pcm: added an 'optional' parameter
* edeccfc alsa-transaction: simplify the cleanup
* 0e9718e alsa-api-pcm: added support of quirks
*   e3209c8 Merge "alsa-utils-dump: added missing ending null char"
|\
| * 1c0ae80 alsa-utils-dump: added missing ending null char
* | d5ac697 Add support for AVIRT
|/
* d5cc09d Git submodule migration to separated libraries

Change-Id: Ia3766b85534f958b59df0ab6cc1369d131cdf4e5
Signed-off-by: Thierry Bultel <thierry.bultel@iot.bzh>