Make Startop Test App run on O and higher

Change-Id: I60af3e06680aa9d3473be11f8d93447166e5fe71
diff --git a/startop/apps/test/Android.bp b/startop/apps/test/Android.bp
index 13b7b5c..db1d305 100644
--- a/startop/apps/test/Android.bp
+++ b/startop/apps/test/Android.bp
@@ -24,5 +24,5 @@
         "src/SystemServerBenchmarkActivity.java",
         "src/TextViewInflationActivity.java",
     ],
-    platform_apis: true,
+    sdk_version: "26", // Android O (8.0) and higher
 }