ODROID-XU4: firstboot: add to restart SSH server at first boot

Signed-off-by: Dongjin Kim <tobetter@gmail.com>

overlay/root/firstboot.sh

@@ -21,4 +21,17 @@ resize2fs ${rootdev}
 
 rm -f /etc/ssh/ssh_host* && ssh-keygen -A
 
+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