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_vb2.h

@@ -38,4 +38,6 @@ int msm_vidc_start_streaming(struct vb2_queue *q, unsigned int count);
 void msm_vidc_stop_streaming(struct vb2_queue *q);
 void msm_vidc_buf_queue(struct vb2_buffer *vb2);
 void msm_vidc_buf_cleanup(struct vb2_buffer *vb);
-#endif // _MSM_VIDC_VB2_H_
+int msm_vidc_buf_out_validate(struct vb2_buffer *vb);
+void msm_vidc_buf_request_complete(struct vb2_buffer *vb);
+#endif // _MSM_VIDC_VB2_H_