Add a minimum Device Tree for Acme Arietta G25.
http://acme.systems/ariettaSigned-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: NSergio Tanzilli <tanzilli@acmesystems.it>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>