[luci-milo] Include experimental builds for chromium.fyi

TBR: tandrii
Bug: 	840631
Change-Id: Iddeb2dc15402138468ad66552c148be1304dd96c
Reviewed-on: https://chromium-review.googlesource.com/1103066Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Commit-Queue: Ryan Tseng <hinoka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567777}

infra/config/global/luci-milo.cfg

@@ -2151,6 +2151,7 @@ consoles {
   repo_url: "https://chromium.googlesource.com/chromium/src"
   ref: "refs/heads/master"
   manifest_name: "REVISION"
+  include_experimental_builds: true
   builders {
     name: "buildbucket/luci.chromium.ci/Android Builder (dbg)"
     category: "android_builder"