ANDROID: GKI: SoC: pcm: Add a restart callback field to struct snd_pcm_ops

This is required to resolve ABI diff for struct snd_pcm_ops.

Test: build
Bug: 151372815
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>
Signed-off-by: Meng Wang <mwang@codeaurora.org>
Change-Id: I380c4ddaa7aa8e5c606dd8db0a9d0c73ad1f7724
(cherry picked from commit ddbe60b8)
[hridya: amended commit to only include ABI diff]
Signed-off-by: Hridya Valsaraju <hridya@google.com>