target-chromium-os-sdk: remove unneeded dependencies

These SDK dependencies are making an upstream package rename from
dev-util/gtk-doc-am to dev-build/gtk-doc-am complicated. We don't need
them, so let's remove them.

BUG=b/307995090
TEST=presubmit
RELEASE_NOTE=None

Change-Id: Ia9b10839b7980705650e1b023ccd93d0ecd9fe0c
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/chromiumos-overlay/+/64360
Reviewed-by: He Gao <hegao@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Chenglong Tang <chenglongtang@google.com>
2 files changed