New attribute is used when bitbake variable is requested without
specifying image name. The attribute should be set from outside,
for example when wic is called with '-e <image>' option.
(From OE-Core rev: 38d0b3744b5829333148ac4fc97dc45a8d0ba3a5)
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>