[DNM] common: pcm/split: add support up to 32 / 8 channels

alsa-project/alsa-ucm-conf pull request #417 was opened from perexg:

**DO NOT MERGE - after 1.2.12!**

MOTU 828 has up to 32 hardware channels. Add support for this configuration to common/pcm/split.conf.

Also, add support for up to 8 channels for the abstact devices (like 7.1 surround).

Note that this change requires recent alsa-lib (Syntax 7).

Link: https://github.com/alsa-project/alsa-ucm-conf/pull/416

Request URL : https://github.com/alsa-project/alsa-ucm-conf/pull/417 Patch URL : https://github.com/alsa-project/alsa-ucm-conf/pull/417.patch Repository URL: https://github.com/alsa-project/alsa-ucm-conf