selftest: Add vulkan-demos to checkpkg exceptions
vulkan-demos has not had any releases.
(From OE-Core rev: 910c16ef8e36286ce3e83e3c259ff7ec027b39b1)
Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Jussi Kukkonen