Allow servicemanager to start processes

Used to lazily start AIDL services.

Bug: 138756857
Test: Manual (using mediaextractor as a test service)
Change-Id: Ia1f2c10072e42d8917985c38500be0955f98b8eb
diff --git a/private/servicemanager.te b/private/servicemanager.te
index 9f675a2..6294452 100644
--- a/private/servicemanager.te
+++ b/private/servicemanager.te
@@ -3,3 +3,5 @@
 init_daemon_domain(servicemanager)
 
 read_runtime_log_tags(servicemanager)
+
+set_prop(servicemanager, ctl_interface_start_prop)