video: driver: request api changes for dynamic controls

- Request api allows to synchronize controls along
  with buffers.
- Client allocates a request fd. This request fd is
  associated with control and set using s_ext_ctrls.
  Such controls are stored by the framework and not
  applied immediately.
- Request fd is also associated with input qbuf and
  queued to driver. Following this actual request is
  queued. Buffers do not enter the queue untill the
  request is queued.
- As part of qbuf, driver call request_setup() which
  inturn sets the control to driver.

Change-Id: I316c4dc2a0091b21059230be5ee5fd6379259456
Signed-off-by: Darshana Patil <quic_darshana@quicinc.com>

driver/vidc/inc/msm_vidc_v4l2.h

@@ -64,5 +64,8 @@ int msm_v4l2_querymenu(struct file *file, void *fh,
 		struct v4l2_querymenu *qmenu);
 unsigned int msm_v4l2_poll(struct file *filp,
 	struct poll_table_struct *pt);
-
+int msm_v4l2_request_validate(struct media_request *req);
+void msm_v4l2_request_queue(struct media_request *req);
+void msm_v4l2_m2m_device_run(void *priv);
+void msm_v4l2_m2m_job_abort(void *priv);
 #endif // _MSM_VIDC_V4L2_H_