Relabel drm related props from exported*_prop

To clean up bad context name exported[23]_default_prop

Bug: 155844385
Test: m selinux_policy
Change-Id: I9f9ddb0d44c4cea9bd1724df730bb7be9a6fb2d2
diff --git a/private/drmserver.te b/private/drmserver.te
index afe4f0a..8449c3e 100644
--- a/private/drmserver.te
+++ b/private/drmserver.te
@@ -5,3 +5,5 @@
 type_transition drmserver apk_data_file:sock_file drmserver_socket;
 
 typeattribute drmserver_socket coredomain_socket;
+
+get_prop(drmserver, drm_service_config_prop)