This is a derivative of image type 'sdk' with 'ivitools' disabled
Apertis: T5428

Signed-off-by: Ritesh Raj Sarraf <ritesh.sarraf@collabora.com>

Use just a single board definition for both SDK images, and
symlinks for the overlay.

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>