AE/Lottie allow Bezier control Ys to be outside the [0..1] range.
Update SkCubicMap to do the same.
Bug: skia:8931
Change-Id: I54ee8dbb4e6e0a33a917500523c82fe56c854d4a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205002
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
