codec2: Add support for updating output delay in avc and hevc decoders

OUTPUT_DELAY was set as 8 for avc and hevc c2 decoder plugins.
It is now set based on the value present in SPS

Bug: 138627015
Test: poc in bug
Test: atest android.media.cts.DecoderTest
Test: atest android.media.cts.AdaptivePlaybackTest

Change-Id: I50f7b3e8bd08c9d3b19e84c3c25acaa4eb767226