Remove android_rel from CQ since all of its machines are offline.

BUG=558213
TBR=phoglund@webrtc.org

Review URL: https://codereview.webrtc.org/1459083002 .

Cr-Commit-Position: refs/heads/master@{#10704}
diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index 80f6f60..fb07c88 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -27,7 +27,8 @@
     buckets {
       name: "tryserver.webrtc"
       builders { name: "android_dbg" }
-      builders { name: "android_rel" }
+      # Remove until crbug.com/558213 is fixed.
+      #builders { name: "android_rel" }
       builders { name: "android_arm64_rel" }
       builders { name: "android_clang_dbg" }
       builders { name: "android_gn_dbg" }