Remove the 'qt5-layer' hardcoded dependence for 'digi-dey' and
dynamically get whether QT5 is being used in the project. This is done
with a new class _qt-version.bbclass_ that is able to get that
information from the project.
https://onedigi.atlassian.net/browse/DEL-8347
Signed-off-by: Javier Viguera <javier.viguera@digi.com>
Javier Viguera