gn-build: Get net_test_bluetooth to compile

This makes net_test_bluetooth compile.

Bug: 21584091

Change-Id: Id0c3d6bdcfd6f2c75c749e7f5a306645371fbb25
diff --git a/BUILD.gn b/BUILD.gn
index c89829f..e6cb5cb 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -28,3 +28,15 @@
     "//vendor_libs:vendor-libs"
   ]
 }
+
+group("bluetooth_tests") {
+  testonly = true
+
+  deps = [
+    "//test/suite:net_test_bluedroid",
+    "//btcore:net_test_btcore",
+    "//hci:net_test_hci",
+    "//osi:net_test_osi",
+    "//device:net_test_device",
+  ]
+}