* in place of inst_addr in messages.
* @signaled : 1 - Host has received ack message from VPU, 0 - not received
* @ctx : context for v4l2 layer integration
- * @dev : platform device of VPU
* @wq : wait queue to wait VPU message ack
* @handler : ipi handler for each decoder
* @codec_type : use codec type to separate different codecs