perfetto-ui: Group CPU freq together

Move CPU Freq tracks below scheduling tracks.

Change-Id: I8569f6d5f28e1cfbd020eec1b5946f1463cf9a07
diff --git a/ui/src/controller/trace_controller.ts b/ui/src/controller/trace_controller.ts
index 88b5081..e6905cd 100644
--- a/ui/src/controller/trace_controller.ts
+++ b/ui/src/controller/trace_controller.ts
@@ -259,7 +259,9 @@
           cpu,
         }
       }));
+    }
 
+    for (let cpu = 0; cpu < numCpus; cpu++) {
       // Only add a cpu freq track if we have
       // cpu freq data.
       // TODO(taylori): Find a way to display cpu idle