Remove unused dstColorSpace parameter from makeTextureImage

Old version still exists until client code is migrated.

Change-Id: I087b6b977f586d334f9a20954e7ed7b5e4b7ea5e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/234579
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index 89dd514..5fa13cf 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -29,3 +29,5 @@
 
  * Add SkCodec::SelectionPolicy for distinguishing between decoding a still image
    or an image sequence for a container format that has both (e.g. HEIF).
+
+* SkImage::makeTextureImage no longer takes an SkColorSpace parameter. It was unused.