parameters: Add handling of str in devices list
parameters: Add handling of str in devices list

Allow specifying simple devices to add as string.

Signed-off-by: Esben Haabendal <da90c138e4a9573086862393cde34fa33d74f6e5@haabendal.dk>

esben/xd-docker,XD-embedded/xd-docker,XD-embedded/xd-docker,esben/xd-docker