Enable prebuilts for amd64-generic
Enable prebuilts for amd64-generic

Enable uploading of the prebuilts so we can start supporting incremental development using prebuilts

Change-Id: I66886ec6e895dcb3dc9ea7498d6456ad8c948499
Reviewed-on: http://gerrit.chromium.org/gerrit/10309
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Reviewed-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Tested-by: Anush Elangovan <be3ea4b32dfea400cfb02e20cf45a400ef235334@chromium.org>
Commit-Ready: Anush Elangovan <be3ea4b32dfea400cfb02e20cf45a400ef235334@chromium.org>

zhang0137/chromite,bpsinc-native/src_third_party_chromite,coreos/chromite,zhang0137/chromite,chadversary/chromiumos.chromite,chadversary/chromiumos.chromite,zhang0137/chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,coreos/chromite,coreos/chromite