msm: audio: qdsp6v2: Fix the issue of memory unmap

- Target freeze observed during monkey run.
- Memory unmap getting called from interrupt context,
  which is causing scheduling during atomic operation.
- Avoid calling memory unmap from interrupt context.

(cherry picked from commit a64fae9ba272ba2f689f30bc7b33c8a1fe4445e5)
Signed-off-by: Deepa Madiregama <dmadireg@codeaurora.org>

Change-Id: Iab9372ba1b2d560c7e161f39483478f0342ac30a
Signed-off-by: Neha Pandey <nehap@codeaurora.org>