[skottie] Add RenderFlag::kDisableTopLevelClipping

TBR=

Change-Id: If63d27eb13176697665f0d081542eae0f7afea9d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/304476
Commit-Queue: Florin Malita <fmalita@google.com>
Reviewed-by: Mike Reed <reed@google.com>
2 files changed