ASoC: msm: qdsp6v2: destroy vocproc during local call hold

In DSDA, if a voice call is put on local call hold tear down
vocproc of that voice session and re create the vocproc again
when local call unhold is called. This is to optimize memory
usage by ADSP during DSDA.

Change-Id: Ic294c8a0d5431aa13838c04cf7c6ae888416e2aa
Signed-off-by: Venkata Narendra Kumar Gutta <vgutta@codeaurora.org>