ASoC: msm: access aux_devs with component list

Update sdm660 machine driver to access aux_devs with component
linked list. Also update the api to create subdirectory to
snd_info_create_subdir().These changes are in accordance with
the upstream changes in ASoC between Linux-4.4 and Linux-4.9 versions.

Change-Id: Ibf1e7dba4c0c6268ef1b1e552e0382bbda8a9f89
Signed-off-by: Rohit Kumar <rohitkr@codeaurora.org>