Move some logic from PacketBuffer to NetEqImpl. Bug: webrtc:13322 Change-Id: I88b1e55c0cd69700730d9ed41be04fcf1effa03f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/328861 Commit-Queue: Jakob Ivarsson <jakobi@webrtc.org> Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org> Cr-Commit-Position: refs/heads/main@{#41270}