h265parse: process SEI recovery point

Similar change as the on I did in h264parse. We want to process SEI
recovery point as keyframe so muxers will mark them as seek points and
decoders will be able to start decoding from them rather than waiting
for an IDR.

gstreamer/gst-plugins-bad#790
3 jobs for gdr-797216 in 5 minutes and 44 seconds (queued for 1 second)
Status Job ID Name Coverage
  Preparation
passed #54889
manifest

00:00:30

 
  Build
passed #54890
build fedora x86_64

00:02:49

 
  Full Builds
passed #54891
build android arm64 api28

00:02:25