hwservicemanager: mark hwservicemanager shutdown critical

Bug: 62951929
Bug: 63514363
Bug: 62845700
Test: Build
Change-Id: I85aaf89fb7c8cc5c7b87446eddce3858a2f47630
diff --git a/hwservicemanager.rc b/hwservicemanager.rc
index dd699f3..96fd5b0 100644
--- a/hwservicemanager.rc
+++ b/hwservicemanager.rc
@@ -8,3 +8,4 @@
     onrestart class_restart early_hal
     writepid /dev/cpuset/system-background/tasks
     class animation
+    shutdown critical