infra: Use goma-ats mixin for Win Goma RBE builders

R=tikuta@chromium.org, ukai@chromium.org, yyanagisawa@chromium.org

Bug: 942651
Change-Id: I95fc408d23b328e40302399d524b8bf2fa8dee2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539216Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Simon Que <sque@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644151}

infra/config/cr-buildbucket.cfg

@@ -2611,20 +2611,23 @@ buckets {
     builders {
       name: "Chromium Win Goma RBE ToT"
       dimensions: "os:Windows-10"
-      mixins: "goma-ci"
       mixins: "experimental"
+      mixins: "goma-ats"
+      mixins: "goma-ci"
     }
     builders {
       name: "Chromium Win Goma RBE Staging"
       dimensions: "os:Windows-10"
-      mixins: "goma-ci"
       mixins: "experimental"
+      mixins: "goma-ats"
+      mixins: "goma-ci"
     }
     builders {
       name: "Chromium Win Goma RBE Staging (clobber)"
       dimensions: "os:Windows-10"
-      mixins: "goma-ci"
       mixins: "experimental"
+      mixins: "goma-ats"
+      mixins: "goma-ci"
     }
     builders {
       name: "Chromium Android ARM 32-bit Goma RBE ToT"