Allow watchdog to dump artd.

Bug: 314171605
Change-Id: Iabb2da390dfe68e9993e0dc7023297afd51a8b3c
Test: Presubmit
diff --git a/private/system_server.te b/private/system_server.te
index 474a7b6..89f0e93 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -373,6 +373,7 @@
   # This is derived from the list that system server defines as interesting native processes
   # to dump during ANRs or watchdog aborts, defined in NATIVE_STACKS_OF_INTEREST in
   # frameworks/base/services/core/java/com/android/server/Watchdog.java.
+  artd
   audioserver
   cameraserver
   drmserver