Merge remote-tracking branch 'remotes/alistair/tags/pull-device-tree-20190409-1'...

Merge remote-tracking branch 'remotes/alistair/tags/pull-device-tree-20190409-1' into staging

Single device tree fix for 4.0

A single patch to avoid an overflow when loading device trees.

# gpg: Signature made Wed 10 Apr 2019 00:52:16 BST
# gpg:                using RSA key F6C4AC46D4934868D3B8CE8F21E10D29DF977054
# gpg: Good signature from "Alistair Francis <alistair@alistair23.me>" [full]
# Primary key fingerprint: F6C4 AC46 D493 4868 D3B8  CE8F 21E1 0D29 DF97 7054

* remotes/alistair/tags/pull-device-tree-20190409-1:
  device_tree: Fix integer overflowing in load_device_tree()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>