video: driver: initial state machine changes

- hierarchical state model which comprises of
  top level states and sub states
- top level states include OPEN, CLOSE, ERROR,
  INPUT_STREAMING, OUTPUT_STREAMING, STREAMING.
- sub states include DRAIN, DRC, DRAIN_LAST_BUFFER,
  DRC_LAST_BUFFER, INPUT_PAUSE, OUTPUT_PAUSE.
- follows deterministic approach for key sequences
  like DRC, DRAIN and last flag handling i.e none
  of these events are ignored or discarded.
- removal of auto start of firmware input port as
  part of ipsc handling.
- introduction of hfi commands for host controlled
  PAUSE and RESUME of firmware ports.
- introduction of information last flag packets
  for DRC and DRAIN when FW has insufficient
  output buffers.

Change-Id: Ie8c8f44af464d06f5a7bb76822f749c9874f869a
Signed-off-by: Darshana Patil <quic_darshana@quicinc.com>

driver/vidc/inc/venus_hfi_response.h

@@ -16,11 +16,6 @@ bool is_valid_port(struct msm_vidc_inst *inst, u32 port,
 	const char *func);
 bool is_valid_hfi_buffer_type(struct msm_vidc_inst *inst,
 	u32 buffer_type, const char *func);
-void handle_session_response_work_handler(struct work_struct *work);
-int handle_session_response_work(struct msm_vidc_inst *inst,
-	struct response_work *work);
-int cancel_response_work(struct msm_vidc_inst *inst);
-int cancel_response_work_sync(struct msm_vidc_inst *inst);
 int handle_system_error(struct msm_vidc_core *core,
 	struct hfi_packet *pkt);
 void fw_coredump(struct msm_vidc_core *core);