Add shell_test_data_file for /data/local/tests

Add a domain for /data/local/tests which will be used by atest
to execute tests on devices as shell or root.

Bug: 138450837
Test: atest binderVendorDoubleLoadTest memunreachable_unit_test memunreachable_binder_test
Change-Id: Ia34314bd9430e21c8b3304ac079e3d9b5705e19c
diff --git a/private/file_contexts b/private/file_contexts
index 5cc5b9b..bd702d2 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -522,6 +522,7 @@
 /data/gsi/ota(/.*)?    u:object_r:ota_image_data_file:s0
 /data/tombstones(/.*)?	u:object_r:tombstone_data_file:s0
 /data/vendor/tombstones/wifi(/.*)? u:object_r:tombstone_wifi_data_file:s0
+/data/local/tests(/.*)?	u:object_r:shell_test_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