Update Android.bp to reexport dependent packages.

Test: mma
Change-Id: Iaca7300c366c2c9e860a29e6a111248d315cc5b4
diff --git a/example/extension/light/2.0/Android.bp b/example/extension/light/2.0/Android.bp
index 4cdbc66..2a4eddf 100644
--- a/example/extension/light/2.0/Android.bp
+++ b/example/extension/light/2.0/Android.bp
@@ -48,5 +48,6 @@
         "libhidl",
         "libhwbinder",
         "libutils",
+        "android.hardware.light@2.0",
     ],
 }