OggWriter: Support format without CSD for opus

If format doesn't contain CSD, then look for it when writing sample
data.
When CSD is present in both Format and sample data, the one in format
is used like MPEG4Writer.

Bug: 131747486
Bug: 134509194
Test: poc from bug

Change-Id: If2cab79d540688283afb4d74a6b043ea2e089ef0