perfetto: Move perfetto_cmd out of traced

perfetto_cmd ended up not using the traced shared library.

Change-Id: Ib4475fe6ef371a3385eb80f1309b121572b53024
diff --git a/BUILD.gn b/BUILD.gn
index aeff135..b562775 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -141,10 +141,10 @@
   executable("perfetto") {
     deps = [
       "gn:default_deps",
-      "src/traced/perfetto_cmd",
+      "src/perfetto_cmd",
     ]
     sources = [
-      "src/traced/perfetto_cmd/main.cc",
+      "src/perfetto_cmd/main.cc",
     ]
     if (is_android) {
       deps += [ "src/base:android_task_runner" ]