ANDROID: GKI: ALSA: PCM: User control API implementation

Introduced a new helper function snd_pcm_add_usr_ctls() to
create control elements representing the user control for each
PCM (sub)stream

Test: make
Bug: 151372815
Signed-off-by: Jayasena Sangaraboina <jsanga@codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>
Signed-off-by: Meng Wang <mwang@codeaurora.org>
(cherry picked from commit d853455a8601a12383cc526523336ea6776b2b09)
Signed-off-by: Hridya Valsaraju <hridya@google.com>
Change-Id: I42a8931a31c5b3e3dd817013230550fdf6cd5849