arm64: dts: marvell: mark CP110 ahci as dma-coherent

The hardware is clearly DMA coherent and not marking it as such leads
to cache coherency problems, at least with the OpenBSD kernel.
Signed-off-by: NMark Kettenis <kettenis@openbsd.org>
Signed-off-by: NGregory CLEMENT <gregory.clement@bootlin.com>

arch/arm64/boot/dts/marvell/armada-cp110.dtsi

@@ -233,6 +233,7 @@
 			compatible = "marvell,armada-8k-ahci",
 			"generic-ahci";
 			reg = <0x540000 0x30000>;
+			dma-coherent;
 			interrupts = <ICU_GRP_NSR 107 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&CP110_LABEL(clk) 1 15>,
 				 <&CP110_LABEL(clk) 1 16>;