Don't generate the delta sysroot anymore.
Don't generate the delta sysroot anymore.

The delta sysroot takes >25 minutes to generate for some reason.
Disable it while this can be investigated.

BUG=chromium:278512
TEST=cbuildbot_config_unittest.py

Change-Id: Ia6938f76371d9cc95bac1aa4fa282e738e5b9049
Reviewed-on: https://gerrit.chromium.org/gerrit/66978
Reviewed-by: Peter Mayo <3d31fdaf44dc55bb1b4f50b19df9bc879177d37a@chromium.org>
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite