cros_generate_stateful_update_payload: Remove in favor of new chromite version

This commit removes cros_generate_stateful_update_payload in favor of
the new chromitized version available.

CQ-DEPEND=CL:1147743
BUG=chromium:860072
TEST=precq

Change-Id: I6799fd56e2fce1971a059abfddfde0bf4bd4675c
Reviewed-on: https://chromium-review.googlesource.com/1147745
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
1 file changed