llvmbot monitor: Move Arm lldb to silent

See https://github.com/llvm/llvm-project/issues/96750 for details.

Change-Id: I7fcbe5af69effb866dc1bf3e0d9766d7806e2b31
diff --git a/monitor/linaro.json b/monitor/linaro.json
index 637062c..3cadbcc 100644
--- a/monitor/linaro.json
+++ b/monitor/linaro.json
@@ -52,7 +52,6 @@
         "name": "LLDB",
         "bots": [
           { "name": "lldb-aarch64-ubuntu" },
-          { "name": "lldb-arm-ubuntu" },
           { "name": "lldb-aarch64-windows" }
         ]
       },
@@ -77,5 +76,19 @@
         ]
       }
     ]
+  },
+  {
+    "name": "LLVM Silent Master",
+    "base_url": "https://lab.llvm.org/staging",
+    "builder_url": "builders",
+    "build_url": "builds",
+    "builders": [
+      {
+        "name": "LLDB",
+        "bots": [
+          { "name": "lldb-arm-ubuntu" }
+        ]
+      }
+    ]
   }
 ]