video: driver: request api fixes for v4l2-compliance

- add support for prepare_buf
- check if client has configured invalid fd for metadata
  buffer fd control.

Change-Id: I576d02be05e4692a5ab45286895c34284f08651c
Signed-off-by: Darshana Patil <darshana@quicinc.com>

driver/vidc/inc/msm_vidc_driver.h

@@ -450,7 +450,7 @@ bool res_is_less_than(u32 width, u32 height,
 bool res_is_less_than_or_equal_to(u32 width, u32 height,
 	u32 ref_width, u32 ref_height);
 int msm_vidc_get_properties(struct msm_vidc_inst *inst);
-int msm_vidc_create_input_metadata_buffer(struct msm_vidc_inst *inst, u32 buf_fd);
+int msm_vidc_create_input_metadata_buffer(struct msm_vidc_inst *inst, int buf_fd);
 int msm_vidc_update_input_meta_buffer_index(struct msm_vidc_inst *inst, struct vb2_buffer *vb2);
 #endif // _MSM_VIDC_DRIVER_H_