v4l2: remove empty get/set_property from v4l2h264enc
v4l2: remove empty get/set_property from v4l2h264enc

Empty get/set_property functions disable parent class features

veo-labs/gst-plugins-good,veo-labs/gst-plugins-good,veo-labs/gst-plugins-good,veo-labs/gst-plugins-good