Revert "dsp: voice_mhi: use modified mhi sync/put api"

This reverts commit 40c749da.
This change needs a corresponding change in msm-4.19 which is
not yet ready. Revert this change for now, until the dependency
change is ready to be merged.

Change-Id: I7ac030b03c01500e6061dbc6e5b4ad13385a0109
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>