arm64: tegra: Do not mark display hub as simple bus

The display hub on Tegra186 and Tegra194 is not a simple bus, so drop
the corresponding compatible string.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra186.dtsi

@@ -990,7 +990,7 @@ i2c-bus {
 		};
 
 		display-hub@15200000 {
-			compatible = "nvidia,tegra186-display", "simple-bus";
+			compatible = "nvidia,tegra186-display";
 			reg = <0x15200000 0x00040000>;
 			resets = <&bpmp TEGRA186_RESET_NVDISPLAY0_MISC>,
 				 <&bpmp TEGRA186_RESET_NVDISPLAY0_WGRP0>,

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

@@ -1055,7 +1055,7 @@ host1x@13e00000 {
 			interconnect-names = "dma-mem";
 
 			display-hub@15200000 {
-				compatible = "nvidia,tegra194-display", "simple-bus";
+				compatible = "nvidia,tegra194-display";
 				reg = <0x15200000 0x00040000>;
 				resets = <&bpmp TEGRA194_RESET_NVDISPLAY0_MISC>,
 					 <&bpmp TEGRA194_RESET_NVDISPLAY0_WGRP0>,