llvmbot monitor: Move lldb ARM to silent

While https://github.com/llvm/llvm-project/issues/68987 is fixed.

Change-Id: Ic127a7820a91c93796734fff6c3d8da2b22ac4ed
diff --git a/monitor/linaro.json b/monitor/linaro.json
index 3f4bf12..2819068 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" }
         ]
       },
@@ -79,6 +78,20 @@
     ]
   },
   {
+    "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" }
+        ]
+      }
+    ]
+  },
+  {
     "name": "Buildkite",
     "base_url": "https://www.buildkite.com",
     "buildkite_org": "llvm-project",