ARM: dts: rockchip: set system-power-controller property on rk3288-rock2

The act8846 on rock2 boards controls the system power, so add the
appropriate property to allow turning off the board.

Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
1 file changed