Odroidxu3 v2012.07

Hi,
  Here are some fixes for u-boot on the XU3.

  --- I've included fanta's fixes from the XU branch to enable HYP mode booting
  --- I've changed the way the fastboot command works, so partitions are checked at flash time, not at fastboot time.  This means you can do
     fastboot boot uImage
  even with an Ubuntu flash layout.