Let system_server writes to dumpstate.options property.

Currently, we define 4 hardcoded init services to launch dumpstate with
different command-line options (since dumpstate must be launched by
root):

- bugreport
- bugreportplus
- bugreportwear
- bugreportremote

This approach does not scale well; a better option is to have just one
service, and let the framework pass the extra arguments through a system
property.

BUG: 31649719
Test: manual

Change-Id: I7ebbb7ce6a0fd3588baca6fd76653f87367ed0e5
diff --git a/property_contexts b/property_contexts
index 2ae1bb0..34191db 100644
--- a/property_contexts
+++ b/property_contexts
@@ -32,6 +32,7 @@
 debug.                  u:object_r:debug_prop:s0
 debug.db.               u:object_r:debuggerd_prop:s0
 dumpstate.              u:object_r:dumpstate_prop:s0
+dumpstate.options       u:object_r:dumpstate_options_prop:s0
 log.                    u:object_r:log_prop:s0
 log.tag                 u:object_r:log_tag_prop:s0
 log.tag.WifiHAL         u:object_r:wifi_log_prop:s0