servicemanager started property

If something starts before servicemanager does,
intelligently wait for servicemanager to start rather
than sleeping for 1s.

Bug: 239382640
Test: boot
Change-Id: If0380c3a1fce937b0939cd6137fcb25f3e47d14c
diff --git a/private/servicemanager.te b/private/servicemanager.te
index 56a41e1..95a9496 100644
--- a/private/servicemanager.te
+++ b/private/servicemanager.te
@@ -5,6 +5,7 @@
 read_runtime_log_tags(servicemanager)
 
 set_prop(servicemanager, ctl_interface_start_prop)
+set_prop(servicemanager, servicemanager_prop)
 
 # servicemanager is using bootstrap bionic
 use_bootstrap_libs(servicemanager)