VP9: Added support for video size change (scaling down) on inter frames. (#508)

* * rocDecode/VP9: Added support for video size change (scaling down) on inter frames.
 - A new reconfigure mode is added, where we keep the existing VAAPI surfaces and context, and work on the smaller images and store the images in the surfaces.

* * rocDecode/VP9 resize: Added changes based on review comments.

src/parser/hevc_parser.cpp

@@ -190,6 +190,7 @@ int HevcVideoParser::FillSeqCallbackFn(HevcSeqParamSet* sps_data) {
     video_format_params_.display_aspect_ratio.x = disp_width / gcd;
     video_format_params_.display_aspect_ratio.y = disp_height / gcd;
 
+    video_format_params_.reconfig_options = ROCDEC_RECONFIG_NEW_SURFACES;
     if (sps_data->vui_parameters_present_flag) {
         video_format_params_.video_signal_description.video_format = sps_data->vui_parameters.video_format;
         video_format_params_.video_signal_description.video_full_range_flag = sps_data->vui_parameters.video_full_range_flag;