ASoC: msm: treat partial drain like full drain

Change-Id: I3a9d7e7a62f0eefb941b68d0ee40657998549f76
Signed-off-by: Haynes Mathew George <hgeorge@codeaurora.org>
Signed-off-by: Eric Laurent <elaurent@google.com>
Git-commit: 1f1aac6eee5e080e9bd70bd6d56da3b4435273e8
Git-repo: https://android.googlesource.com/kernel/msm


Signed-off-by: Dhananjay Kumar <dhakumar@codeaurora.org>