Revert "llvmbot monitor: Move lldb ARM to silent"

This reverts commit 7f064d26d5fb6c63b7a228cc3416aada5dc919c3.
Tests are now passing again.

Change-Id: I7f4ab51f1a7400e91a0588eeafa76f42ce790f1d
diff --git a/monitor/linaro.json b/monitor/linaro.json
index 2819068..3f4bf12 100644
--- a/monitor/linaro.json
+++ b/monitor/linaro.json
@@ -52,6 +52,7 @@
         "name": "LLDB",
         "bots": [
           { "name": "lldb-aarch64-ubuntu" },
+          { "name": "lldb-arm-ubuntu" },
           { "name": "lldb-aarch64-windows" }
         ]
       },
@@ -78,20 +79,6 @@
     ]
   },
   {
-    "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",