This CL set the spatial id in LibaomAv1Encoder and set correct number of spatial layers for AV1 in FrameEncodeMetadataWriter. Bug: None Change-Id: I40092e45be88ec9ab75f228d9ca84c44e3cad326 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/237662 Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Commit-Queue: Zhaoliang Ma <zhaoliang.ma@intel.com> Cr-Commit-Position: refs/heads/main@{#35339}