Remove legacy SkImageGenerator YUV planes interface

Bug: skia:10632
Change-Id: Iaed6b51e03ef9023a74d77f3262104c1677c416f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/327917
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index e2d4147..c3159b4 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -9,10 +9,15 @@
 
   * <insert new release notes here>
 
+  * Legacy 8-bit YUV interface removed from SkImageGenerator. Use more flexible SkYUVAPixmaps-
+    based interface instead.
+    https://review.skia.org/327917
+
   * New variant of SkImage::MakeFromYUVATextures. Takes a new type GrYUVATextures
     which wraps an SkYUVAInfo and compatible set of GrBackendTextures. The provides
     a more complete and structured specification of the planar configuration. Previous
     version is deprecated.
+    https://review.skia.org/317762
 
   * Add field to GrContextOptions to disable mipmap support even if the backend
     supports it.