[sksg] Remove redundant BUILD.gn deps

Skottie pulls SkSG as needed, we prolly don't need all these explicit
deps.

TBR=
Change-Id: I7a641c5b0a5be52185c240ba522f0758e79aff85
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/278677
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
Auto-Submit: Florin Malita <fmalita@chromium.org>
1 file changed