ANDROID: GKI: ALSA: pcm: add locks for accessing runtime resource

Add spin lock to resolve race conditions while
accessing substream runtime resource.

Change-Id: I8db743303ceb50205d62adfc02caf6ecab635d47
Signed-off-by: Karthikeyan Mani <kmani@codeaurora.org>
Bug: 151372815
(cherry picked from commit f5879f21)
Signed-off-by: Saravana Kannan <saravanak@google.com>