ASoC: msm: qdsp6v2: Unblock drain on reset event callback

Unblock drain on reset event callback from DSP as drain is
aborted in this case and it should be considered completed
with error.

Change-Id: Iafc68eb6b75c21635d7ada4c56dd5af0b4b2c233
Signed-off-by: Dhananjay Kumar <dhakumar@codeaurora.org>