Add label for kernel test files and executables

This required for kernel to do loopback mounts on filesystem
images created by the kernel system call tests in LTP.

Add a corresponding neverallow to stop all domains from accessing
the location at /data/local/tmp/ltp.

Bug: 73220071
Test: Boot sailfish successfully
Test: run vts-kernel -m VtsKernelLtp -t syscalls.fchown04

Change-Id: I73f5f14017e22971fc246a05751ba67be4653bca
Signed-off-by: Sandeep Patil <sspatil@google.com>
diff --git a/private/file_contexts b/private/file_contexts
index 321cfbe..10a8a71 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -365,6 +365,7 @@
 /data/tombstones(/.*)?	u:object_r:tombstone_data_file:s0
 /data/vendor/tombstones/wifi(/.*)? u:object_r:tombstone_wifi_data_file:s0
 /data/local/tmp(/.*)?	u:object_r:shell_data_file:s0
+/data/local/tmp/ltp(/.*)?   u:object_r:nativetest_data_file:s0
 /data/local/traces(/.*)?	u:object_r:trace_data_file:s0
 /data/media(/.*)?	u:object_r:media_rw_data_file:s0
 /data/mediadrm(/.*)?	u:object_r:media_data_file:s0