arm64: tegra: Add dma-coherent for Tegra194 VIC

DMA operations for the Tegra194 Video Image Compositor (VIC) are
coherent and so populate the 'dma-coherent' property.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra194.dtsi

@@ -1811,6 +1811,7 @@ vic@15340000 {
 						<&mc TEGRA194_MEMORY_CLIENT_VICSWR &emc>;
 				interconnect-names = "dma-mem", "write";
 				iommus = <&smmu TEGRA194_SID_VIC>;
+				dma-coherent;
 			};
 
 			nvjpg@15380000 {