arm64: tegra: Add unit-address for CBB on Tegra194

The control back-bone (CBB) starts at physical address 0, so give it a
unit-address to comply with standard naming practices checked for by the
device tree compiler.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi

@@ -8,17 +8,17 @@ / {
 	compatible = "nvidia,p2888", "nvidia,tegra194";
 
 	aliases {
-		sdhci0 = "/cbb/sdhci@3460000";
-		sdhci1 = "/cbb/sdhci@3400000";
+		sdhci0 = "/cbb@0/sdhci@3460000";
+		sdhci1 = "/cbb@0/sdhci@3400000";
 		serial0 = &tcu;
 		i2c0 = "/bpmp/i2c";
-		i2c1 = "/cbb/i2c@3160000";
-		i2c2 = "/cbb/i2c@c240000";
-		i2c3 = "/cbb/i2c@3180000";
-		i2c4 = "/cbb/i2c@3190000";
-		i2c5 = "/cbb/i2c@31c0000";
-		i2c6 = "/cbb/i2c@c250000";
-		i2c7 = "/cbb/i2c@31e0000";
+		i2c1 = "/cbb@0/i2c@3160000";
+		i2c2 = "/cbb@0/i2c@c240000";
+		i2c3 = "/cbb@0/i2c@3180000";
+		i2c4 = "/cbb@0/i2c@3190000";
+		i2c5 = "/cbb@0/i2c@31c0000";
+		i2c6 = "/cbb@0/i2c@c250000";
+		i2c7 = "/cbb@0/i2c@31e0000";
 	};
 
 	chosen {
@@ -26,7 +26,7 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
-	cbb {
+	cbb@0 {
 		ethernet@2490000 {
 			status = "okay";
 

arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts

@@ -10,7 +10,7 @@ / {
 	model = "NVIDIA Jetson AGX Xavier Developer Kit";
 	compatible = "nvidia,p2972-0000", "nvidia,tegra194";
 
-	cbb {
+	cbb@0 {
 		aconnect {
 			status = "okay";
 

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

@@ -15,7 +15,7 @@ / {
 	#size-cells = <2>;
 
 	/* control backbone */
-	cbb {
+	cbb@0 {
 		compatible = "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;