infra: Move some builders in chromium.goma.fyi under "prod"

These builders have been updated to use the RBE Prod cluster.

Bug: 947436
Change-Id: I72294b236a65e29c97d56f7eaf95fd3443c7b747
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1608964Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Simon Que <sque@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659308}

infra/config/luci-milo.cfg

@@ -2678,34 +2678,34 @@ consoles {
   }
   builders {
     name: "buildbucket/luci.chromium.ci/Cast Linux (Goma RBE FYI)"
-    category: "tot|chromium.linux|cast"
+    category: "prod|chromium.linux|cast"
     short_name: "vid"
   }
   builders {
     name: "buildbucket/luci.chromium.ci/fuchsia-fyi-arm64-rel (Goma RBE FYI)"
-    category: "tot|chromium.linux|fuchsia|misc"
+    category: "prod|chromium.linux|fuchsia|misc"
     short_name: "a64"
   }
   builders {
     name: "buildbucket/luci.chromium.ci/fuchsia-fyi-x64-rel (Goma RBE FYI)"
-    category: "tot|chromium.linux|fuchsia|misc"
+    category: "prod|chromium.linux|fuchsia|misc"
     short_name: "x64"
   }
-  builders {
-    name: "buildbucket/luci.chromium.ci/chromeos-amd64-generic-rel (Goma RBE FYI)"
-    category: "tot|chromium.chromiumos|simple|release|x64"
-    short_name: "rel"
-  }
   builders {
     name: "buildbucket/luci.chromium.ci/Linux ASan LSan Builder (Goma RBE FYI)"
-    category: "tot|chromium.memory|linux|asan lsan"
+    category: "prod|chromium.memory|linux|asan lsan"
     short_name: "bld"
   }
   builders {
     name: "buildbucket/luci.chromium.ci/Linux MSan Builder (Goma RBE FYI)"
-    category: "tot|chromium.memory|linux|msan"
+    category: "prod|chromium.memory|linux|msan"
     short_name: "bld"
   }
+  builders {
+    name: "buildbucket/luci.chromium.ci/chromeos-amd64-generic-rel (Goma RBE FYI)"
+    category: "tot|chromium.chromiumos|simple|release|x64"
+    short_name: "rel"
+  }
 }
 
 consoles {