llkd: Add stack symbol checking

llkd needs the ptrace capabilities and dac override to monitor for
live lock conditions on the stack dumps.

Test: compile
Bug: 33808187
Change-Id: Ibc1e4cc10395fa9685c4ef0ca214daf212a5e126
diff --git a/private/property_contexts b/private/property_contexts
index 2726d84..b0f8653 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -34,6 +34,10 @@
 debug.db.               u:object_r:debuggerd_prop:s0
 dumpstate.              u:object_r:dumpstate_prop:s0
 dumpstate.options       u:object_r:dumpstate_options_prop:s0
+llk.                    u:object_r:llkd_prop:s0
+khungtask.              u:object_r:llkd_prop:s0
+ro.llk.                 u:object_r:llkd_prop:s0
+ro.khungtask.           u:object_r:llkd_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