iopsys-econet: Device target model build

Bartlomiej Grzeskowiakrequested to merge
bg-OSBNB00139890-20220412-AirohaSDK-device-model into devel

@sukrus @AGnau - please comment

Adapt build process to device target model. Based on ramips/mt7621 target.

Signed-off-by: Bartlomiej Grzeskowiak bartlomiej.grzeskowiak@iopsys.eu

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