ALSA: aaci: Use managed buffer allocation

Clean up the driver with the new managed buffer allocation API.
The superfluous snd_pcm_lib_malloc_pages() and
snd_pcm_lib_free_pages() calls are dropped, and the if block is
flattened accordingly.

Link: https://lore.kernel.org/r/20191209094943.14984-3-tiwai@suse.de


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