arm64: dts: fsl: DPAA FMan DMA operations are coherent

Although the DPAA 1 FMan operations are coherent, the device tree
node for the FMan does not indicate that, resulting in a needless
loss of performance. Adding the missing dma-coherent property.

Fixes: 1ffbecdd ("arm64: dts: add DPAA FMan nodes")
Signed-off-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Tested-by: Camelia Groza <camelia.groza@oss.nxp.com>
Acked-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/qoriq-fman3-0.dtsi

@@ -19,6 +19,7 @@ fman0: fman@1a00000 {
 	clock-names = "fmanclk";
 	fsl,qman-channel-range = <0x800 0x10>;
 	ptimer-handle = <&ptp_timer0>;
+	dma-coherent;
 
 	muram@0 {
 		compatible = "fsl,fman-muram";