libs: encoder: Add properties for h264 fei encoder.
libs: encoder: Add properties for h264 fei encoder.

Install properties for h264 fei encoder class. Also set the new get/set
property functions for gobject class. Still use the old properties
way now and this new feature will be enabled later.

ceyusa/gstreamer-vaapi,ceyusa/gstreamer-vaapi,GStreamer/gstreamer-vaapi,GStreamer/gstreamer-vaapi