cros_generate_update_payload: Remove in favor of new chromite version

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

CQ-DEPEND=CL:1145908
BUG=chromium:860072
TEST=precq

Change-Id: Ia333df642f78f76fe311e30c7ab3e9bdcb4e55e9
Reviewed-on: https://chromium-review.googlesource.com/1145771
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