Move file labeling to genfs_contexts.

This should improve performance, as file_contexts is slower than
genfs_contexts.

Bug: 62413700
Test: Built, flashed, and booted Sailfish.  Verified that the
files have the correct context and that wifi, web, and atrace work.

Merged-In: Ia28707ec565a0792bc882fbffe9e8ab9968535f5
Change-Id: I9546f3af3c95e3443684ae4764881b69987611ef
diff --git a/private/system_server.te b/private/system_server.te
index 850203b..fdde295 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -656,6 +656,7 @@
 
 # Allow WifiService to start, stop, and read wifi-specific trace events.
 allow system_server debugfs_tracing_instances:dir search;
+allow system_server debugfs_wifi_tracing:dir search;
 allow system_server debugfs_wifi_tracing:file rw_file_perms;
 
 # allow system_server to exec shell on ASAN builds. Needed to run