[bazel] Remove all macros from public.bzl
[bazel] Remove all macros from public.bzl

After http://cl/467920218 we no longer need skia_select or any other
macro in public.bzl.

This also removes the unused list of files for skottie_tool

No-Try: true
Change-Id: I0a6aa017967c1c671875403026cc797edd983a25
Bug: b/237076898
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/569333
Auto-Submit: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>
Reviewed-by: Ben Wagner <53965154ffeecc4a10886eab9259e95965f2979a@google.com>
Commit-Queue: Ben Wagner <53965154ffeecc4a10886eab9259e95965f2979a@google.com>

google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia