arm64: tegra: Mark host1x as dma-coherent on Tegra194/234

Ensure appropriate configuration is done to make the host1x device
and context devices DMA coherent by adding the dma-coherent flag.

Fixes: b35f5b53 ("arm64: tegra: Add context isolation domains on Tegra234")
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

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

@@ -1923,6 +1923,7 @@ host1x@13e00000 {
 			interconnects = <&mc TEGRA194_MEMORY_CLIENT_HOST1XDMAR &emc>;
 			interconnect-names = "dma-mem";
 			iommus = <&smmu TEGRA194_SID_HOST1X>;
+			dma-coherent;
 
 			/* Context isolation domains */
 			iommu-map = <0 &smmu TEGRA194_SID_HOST1X_CTX0 1>,

arch/arm64/boot/dts/nvidia/tegra234.dtsi

@@ -2151,6 +2151,7 @@ host1x@13e00000 {
 			interconnects = <&mc TEGRA234_MEMORY_CLIENT_HOST1XDMAR &emc>;
 			interconnect-names = "dma-mem";
 			iommus = <&smmu_niso1 TEGRA234_SID_HOST1X>;
+			dma-coherent;
 
 			/* Context isolation domains */
 			iommu-map = <0 &smmu_niso0 TEGRA234_SID_HOST1X_CTX0 1>,