Use IDLE bit instead of referenced bit.

Bug: 132952543
Change-Id: I854a3b4e30b89c2953cf3246a11d0555cb946042
diff --git a/Android.bp b/Android.bp
index a07358c..7268285 100644
--- a/Android.bp
+++ b/Android.bp
@@ -215,6 +215,20 @@
   ],
 }
 
+// GN target: //:idle_alloc
+cc_binary {
+  name: "idle_alloc",
+  srcs: [
+    "tools/idle_alloc.cc",
+  ],
+  shared_libs: [
+    "liblog",
+  ],
+  defaults: [
+    "perfetto_defaults",
+  ],
+}
+
 // GN target: //:libperfetto
 cc_library_shared {
   name: "libperfetto",