kselftest/alsa: Log the PCM ID in pcm-test

Drivers report a string with a name for each PCM, log it during startup of
pcm-test as a diagnostic aid.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20240716-alsa-kselftest-board-name-v2-2-60f1acdde096@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>