Aperture: Set SDK version to current in Android.bp

Change-Id: Iecc21cee26acc4bcb7d7bb3b6c4723b40765fe6b
diff --git a/app/Android.bp b/app/Android.bp
index 874213c..f3d9395 100644
--- a/app/Android.bp
+++ b/app/Android.bp
@@ -11,6 +11,7 @@
     resource_dirs: ["src/main/res"],
     manifest: "src/main/AndroidManifest.xml",
 
+    sdk_version: "current",
     product_specific: true,
     platform_apis: true,