Set sdk_version 'system_current'
am: 6fb887ed18

Change-Id: Ic12fa58d3fcac18b1a261b5248a1762beb0b7a68
diff --git a/Android.bp b/Android.bp
index 764dc49..3783408 100644
--- a/Android.bp
+++ b/Android.bp
@@ -83,6 +83,7 @@
 
     min_sdk_version: "28",
     target_sdk_version: "28",
+    sdk_version: "system_current",
 }
 
 android_app {