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.h

@@ -25,8 +25,6 @@ int msm_vidc_s_selection(void* instance, struct v4l2_selection* s);
 int msm_vidc_g_selection(void* instance, struct v4l2_selection* s);
 int msm_vidc_s_param(void *instance, struct v4l2_streamparm *sp);
 int msm_vidc_g_param(void *instance, struct v4l2_streamparm *sp);
-int msm_vidc_s_ext_ctrl(void *instance, struct v4l2_ext_controls *a);
-int msm_vidc_g_ext_ctrl(void *instance, struct v4l2_ext_controls *a);
 int msm_vidc_reqbufs(void *instance, struct v4l2_requestbuffers *b);
 int msm_vidc_release_buffer(void *instance, int buffer_type,
 		unsigned int buffer_index);