ALSA: pcxhr: use __func__ to get funcion's name in an output message

Prefer using '"%s...", __func__' to get current function's name in
an output message.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Link: https://lore.kernel.org/r/20210731052647.141046-1-wangborong@cdjrlc.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>