[Luci] Update cr-buildbucket.cfg for Linux Tests (dbg)(1)(32).

Bug: 790142
Change-Id: I75ff6b9450560165ddce782754a74d5384d66556
Reviewed-on: https://chromium-review.googlesource.com/977052Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Zhiling Huang <hzl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545499}

infra/config/global/cr-buildbucket.cfg

@@ -503,6 +503,11 @@ buckets {
       mixins: "linux-ci"
     }
 
+    builders {
+      name: "Linux Tests (dbg)(1)(32)"
+      mixins: "linux-ci"
+    }
+
     builders {
       name: "GPU FYI Linux Builder"
       mixins: "linux-gpu-fyi-ci"