libmix: add support for Error Reporting needed by WebRTC

BZ: 147912

The error will be reported when the frame is removed from output
queue for rendering.

Change-Id: Ibcf9dc0dcaf31c62b76a8f51acb13157b71403e1
Signed-off-by: Dan Liang <dan.liang@intel.com>
6 files changed