u-boot: fix beaglebone boot issue with large kernel images
Fix beaglebone boot issue with large kernel images overwriting Device Tree.
See very detailed comments inside the patch.
The original patch is being reviewed upstream and is targeting mainline U-boot
version 2014.07. This is the adaptation of the patch for 2013.07 version we use
Signed-off-by: Denys Dmytriyenko <denys@ti.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
