Revert "Use "packout" reboot reason for the firstboot shutdown"

This reverts commit 3a803b5cc4d4cc4bcfc99d60d5e409b8dd656cff.

Reason for revert: Dependency was reverted

Bug: 113227183
Change-Id: Ie01ec66db811514b9d8e9f4e98186f98d70eb2fc
diff --git a/init.firstboot.sh b/init.firstboot.sh
index f520405..05a1b85 100755
--- a/init.firstboot.sh
+++ b/init.firstboot.sh
@@ -15,4 +15,4 @@
 done;
 
 # Shutdown
-setprop sys.powerctl reboot,packout
+setprop sys.powerctl shutdown