orion-wdt refuses to start without these properties defined, so lift
definitions out of kirkwood/dove.dtsi

[gregory.clement@free-electrons.com: fix commit title]
Signed-off-by: NJamie Lentin <jm@lentin.co.uk>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>