ALSA: core: Implement compress page allocation and free routines

Add simple malloc and free methods for memory management for compress
streams. Based on snd_pcm_lib_malloc_pages and snd_pcm_lib_free_pages
implementation.

Signed-off-by: Divya Prakash <divya1.prakash@intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200218143924.10565-3-cezary.rojewski@intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>