Merge "codec2: Fix comment about B_FRAME." am: 1f63950e9e am: f5bc769046 am: 9b6f95fe31

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1894878

Change-Id: Id23cdaf23f4905720b801a3f12cc9b7bfa375cd3