Backport of "libs: decoder: h265: skip all pictures prior the first I-frame" into 1.16
requested to merge tpm/gstreamer-vaapi:backport-mr-199-into-1.16-h265-skip-initial-non-i-frames into 1.16
Backport of !199 (merged) "libs: decoder: h265: skip all pictures prior the first I-frame".
Commits:
- 1168d6d5 libs: decoder: h265: skip all pictures prior the first I-frame