SF: compile libsurfaceflingerflags_test as test

Bug: 304338314
Test: presubmit
Change-Id: I63daf9be78af684db11f3c6fc6207c69bb17a865
diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 91910c7..ec21eaf 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -45,8 +45,7 @@
 cc_aconfig_library {
     name: "libsurfaceflingerflags_test",
     aconfig_declarations: "surfaceflinger_flags",
-    // TODO(b/304338314): uncomment the below line once the bug is fixed
-    // test: true,
+    test: true,
 }
 
 cc_test {