ucm: fix again the long name configuration filename lookup

ucm: fix again the long name configuration filename lookup

The fix in commit 77119d83a1f4 assumes that both ucm1 / ucm2 directories
have the configurations for the long name in the same directory. For v2
we changed the location to card_name/card_long_name aka
driver_name/driver_long_name to make the directory layout more structured.

Fixes: 77119d83a1f4 ("ucm: Fix opening of master-configs by the card's longname")

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