ALSA: hda: Use managed buffer allocation

Clean up the common driver module with the new managed buffer
allocation API.  The superfluous snd_pcm_lib_malloc_pages() and
snd_pcm_lib_free_pages() calls are dropped.

Link: https://lore.kernel.org/r/20191209094943.14984-41-tiwai@suse.de


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