Allow system server read binderfs stats

When receiving the binder transaction errors reported by Android
applications, AMS needs a way to verify that information. Currently
Linux kernel doesn't provide such an API. Use binderfs instead until
kernel binder driver adds that functionality in the future.

Bug: 199336863
Test: send binder calls to frozen apps and check logcat
Test: take bugreport and check binder stats logs
Change-Id: I3bab3d4f35616b4a7b99d6ac6dc79fb86e7f28d4
diff --git a/private/genfs_contexts b/private/genfs_contexts
index 3ec6ab1..17db46a 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -392,6 +392,7 @@
 genfscon binder /vndbinder u:object_r:vndbinder_device:s0
 genfscon binder /binder_logs u:object_r:binderfs_logs:s0
 genfscon binder /binder_logs/proc u:object_r:binderfs_logs_proc:s0
+genfscon binder /binder_logs/stats u:object_r:binderfs_logs_stats:s0
 genfscon binder /features u:object_r:binderfs_features:s0
 
 genfscon inotifyfs / u:object_r:inotify:s0