Updating cr-buildbucket.cfg for linux builder dbg32.

Bug: 790142
Change-Id: Ie3b107fdce1fb13972f14049fd1fd5eaba1bb18d
Reviewed-on: https://chromium-review.googlesource.com/965459Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Zhiling Huang <hzl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543596}

infra/config/global/cr-buildbucket.cfg

@@ -497,6 +497,13 @@ buckets {
       dimensions: "cores:32"
     }
 
+    builders {
+      name: "Linux Builder (dbg)(32)"
+      mixins: "linux-ci"
+      dimensions: "cpu:x86-64"
+      dimensions: "cores:32"
+    }
+
     builders {
       name: "Linux Tests (dbg)(1)"
       mixins: "linux-ci"