SEPolicy changes to allow kcov access in userdebug.

This includes the SELinux policy changes to allow for
kcov access in userdebug builds for coverage-guided
kernel fuzzing.

Bug: 117990869

Test: Ran syzkaller with Android untrusted_app sandbox with coverage.
Change-Id: I1fcaad447c7cdc2a3360383b5dcd76e8a0f93f09
diff --git a/private/file.te b/private/file.te
index 8d18a90..fd1c2ee 100644
--- a/private/file.te
+++ b/private/file.te
@@ -9,3 +9,7 @@
 
 # /data/misc/perfetto-traces for perfetto traces
 type perfetto_traces_data_file, file_type, data_file_type, core_data_file_type;
+
+# /sys/kernel/debug/kcov for coverage guided kernel fuzzing in userdebug builds.
+type debugfs_kcov, fs_type, debugfs_type;
+