fit: Don't allow verification of images with @ nodes

When searching for a node called 'fred', any unit address appended to the
name is ignored by libfdt, meaning that 'fred' can match 'fred@1'. This
means that we cannot be sure that the node originally intended is the one
that is used.

Disallow use of nodes with unit addresses.

Update the forge test also, since it uses @ addresses.

CVE-2021-27138

Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Bruce Monroe <bruce.monroe@intel.com>
Reported-by: Arie Haenel <arie.haenel@intel.com>
Reported-by: Julien Lenoir <julien.lenoir@intel.com>

test: vboot: Add a test for a forged configuration

Add a check to make sure that it is not possible to add a new
configuration and use the hashed nodes and hash of another configuration.

Signed-off-by: Simon Glass <sjg@chromium.org>

test: vboot: Add a test for a forged configuration

Add a check to make sure that it is not possible to add a new
configuration and use the hashed nodes and hash of another configuration.

Signed-off-by: Simon Glass <sjg@chromium.org>