ARM: mvebu: Add SATA support for OpenBlocks AX3-4

This patch enables SATA support on the OpenBlocks AX3-4. It has one
internal SATA port, and an external eSATA port.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts

@@ -117,5 +117,9 @@ s35390a: s35390a@30 {
 				reg = <0x30>;
 			};
 		};
+		sata@d00a0000 {
+			nr-ports = <2>;
+			status = "okay";
+		};
 	};
 };