Revert "firstboot: Restart SSH server at first boot"

This reverts commit b62b2b3306.

overlay/root/firstboot.sh

@@ -23,6 +23,17 @@ resize2fs ${rootdev}
 
 rm -f /etc/ssh/ssh_host* && ssh-keygen -A
 
-service ssh restart
+case $(cat /sys/firmware/devicetree/base/model) in
+        "Hardkernel Odroid XU4")
+                need_tweak="true"
+                ;;
+        *)
+                need_tweak="false"
+                ;;
+esac
+
+if [ "x${need_tweak}" = "xtrue" ]; then
+	service ssh restart
+fi
 
 exit 0