Use image-artifact-names
Use image-artifact-names

OE-core has moved IMAGE_ variables to a separate class, and they are not
found without image-artifact-names class.

Signed-off-by: Stefano Babic <2c2905e0c2877c7e4ce40c7425e972302953fda5@denx.de>
Reported-by: Parthiban Nallathambi <6b0b8519cf5d39b6236ee1602e2efab4cd47c619@linumiz.com>
Tested-by: Parthiban Nallathambi <6b0b8519cf5d39b6236ee1602e2efab4cd47c619@linumiz.com>

sbabic/meta-swupdate,sbabic/meta-swupdate