Integrate meta-seco-clea-os-embedded/nspa/qt6-dyn-layer

Commit: clea-os/layers/seco/meta-seco-clea-os-embedded@99285f7b

[QT5][QT6] Handle both QT versions dynamically

• add meta-qt6 to bbalyer.conf
• add BBMASK for meta-qtX layer if QT Y is requested
• correctly handle qtmultimedia for QT6 to only include ffmpeg when the license has been accepted.

Signed-off-by: Nicola Sparnacci nicola.sparnacci@seco.com