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alsa-ucm: fix persistent port names with alsa-lib >= 1.2.5

Igor Kovalenko requested to merge igor.v.kovalenko/pulseaudio:pr/alsa-ucm-private-prefix into master

Alsa UCM device string can contain private configuration prefix required to make correct device open call. Private prefix is dynamically generated by UCM manager depending on internal state. Since pulseaudio sink/source port names currently contain device string, these may change between runs breaking volume database and module arguments referring to sink/source.

Fix this by skipping UCM private prefix available via _alibpref key while creating UCM mapping name. Mapping object will still contain unmodified device string for device open call.

See also https://github.com/alsa-project/alsa-ucm-conf/issues/104

Fixes #1229 (closed)

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