ARM: dts: mvebu: armada-398: update the dtsi about missing interfaces

Beside interfaces described in the armada-39x.dtsi and armada-395.dtsi, the
Armada 398 SoC family supports 2 additional SATA port (2 ports in one unit)

Signed-off-by: Grzegorz Jaszczyk <jaz@semihalf.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>