Add Bluetooth HAL definition

Test: compiles
Bug: 31972505
Change-Id: I7608b0814c9ca697b21c9e115cfcd81ab1364892
diff --git a/Android.bp b/Android.bp
index 5d7c8b8..2350c5f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,6 +1,7 @@
 // This is an autogenerated file, do not edit.
 subdirs = [
     "benchmarks/msgq/1.0",
+    "bluetooth/1.0",
     "nfc/1.0",
     "nfc/1.0/default",
     "radio/1.0",