Revert "Remove TEST_MAPPING"

This corrects the Android.bp and returns the TEST_MAPPING.
This reverts commit 081ad246e6d9559f8e5d8d5df99c1edf8515f597.

Bug: 161459805
Test: treehugger
Change-Id: Iac8c4ae4db4434cf1c2c36b0254363a051fc7c56
diff --git a/Android.bp b/Android.bp
index de90afe..da1f380 100644
--- a/Android.bp
+++ b/Android.bp
@@ -43,6 +43,7 @@
     libs: [
         "junit",
     ],
+    test_suites: ["general-tests"],
 }
 
 // Device tests: atest S2GeometryLibraryJavaTests