CCodecConfig: skip subscribing to optional params until requested

Also fix subscription logic for encoding statistics.

Bug: 232485352
Test: atest android.media.misc.cts.HeifWriterTest
Test: atest android.media.codec.cts.VideoEncodingStatisticsTest
Merged-In: Ie3c65307f43ab7f836ca9faf099b2c4a6560f29d
Change-Id: Ie3c65307f43ab7f836ca9faf099b2c4a6560f29d
2 files changed