sepolicy: allow userinit to set its property

Change-Id: I9d8270d889566d169077a1b1fdaee43059d11ee1
diff --git a/sepolicy/file_contexts b/sepolicy/file_contexts
index ad1c404..7ca945a 100644
--- a/sepolicy/file_contexts
+++ b/sepolicy/file_contexts
@@ -9,6 +9,8 @@
 
 /system/bin/sysinit       u:object_r:sysinit_exec:s0
 
+/system/etc/init.d/90userinit           u:object_r:userinit_exec:s0
+
 # For minivold in recovery
 /sbin/minivold            u:object_r:vold_exec:s0