artik533s.coffee: Set board as experimental
artik533s.coffee: Set board as experimental

This reverts commit 22b374077e9b90ffb7fd7a64c4ae3fcbfd2b7236

Signed-off-by: Vicentiu Galanopulo <316f1858a504e73da779fe12f7a460349852883d@balena.io>

resin-os/resin-artik