Compile health hal with the VNDK.

Test: builds with BOARD_VNDK_VERSION=current
Change-Id: I38ea5afed47026f6068e9aac5de3435ec031f836
diff --git a/health/Android.bp b/health/Android.bp
index 33f70eb..ed19a37 100644
--- a/health/Android.bp
+++ b/health/Android.bp
@@ -1,5 +1,6 @@
 // This is an autogenerated file, do not edit.
 subdirs = [
     "1.0",
+    "1.0/default",
     "1.0/vts/functional",
 ]