ASoC: lsm: use wrapper for ION memory handling

ION memory allocation and mapping happens in different ways for
systems with and without SMMU. Use generic ION wrapper for
using the right set of commands for lsm memory buffers.

Change-Id: If6132a60d245a0b1804a826eceb4187a0c1a5c6e
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>