create /boot/uboot on armhf to ensure that its in the system

tarball and still on the system if ubuntu-core-upgrader
performs a "format" (LP: #1447652)

debian/changelog

@@ -1,3 +1,11 @@
+livecd-rootfs (2.301) UNRELEASED; urgency=low
+
+  * create /boot/uboot on armhf to ensure that its in the system
+    tarball and still on the system if ubuntu-core-upgrader
+    performs a "format" (LP: #1447652)
+
+ -- Michael Vogt <michael.vogt@ubuntu.com>  Tue, 28 Apr 2015 08:27:44 +0200
+
 livecd-rootfs (2.300) vivid; urgency=medium
 
   * live-build/ubuntu-core/hooks/11-remove-extra-packages.chroot: revert

live-build/ubuntu-core/hooks/16-ensure-uboot.chroot

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -e
+
+if [ "$(dpkg --print-architecture)" = "armhf" ]; then
+    mkdir -p /boot/uboot
+fi