ucm: extend snd_use_case_mgr_open() to address the sound card directly

ucm: extend snd_use_case_mgr_open() to address the sound card directly

Some clients like pulseaudio wants to access the multiple instances
of sound cards. This patch adds prefixes like "hw:" to the card_name
argument to handle this. The card index (value) or card identification
(string) can be used for this prefix.

Also the prefix "strict:" was added to avoid the driver name and
driver long name matching. It might be useable for use case
configurations which are not bound to the one sound card.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>