ALSA: wavefront: remove snd_wavefront_xxx()

There is no snd_wavefront_xxx() implementation, and no one is using it.
Let's remove it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/87msbmpqls.wl-kuninori.morimoto.gx@renesas.com


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