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.

Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20191210142614.19405-6-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>