arm64: tegra: Clarify that P2888 is the Jetson AGX Xavier

P2888 is the internal part number for the Jetson AGX Xavier module.
Clarify that using the DT model property.
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

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

@@ -4,7 +4,7 @@
 #include <dt-bindings/mfd/max77620.h>
 
 / {
-	model = "NVIDIA Tegra194 P2888 Processor Module";
+	model = "NVIDIA Jetson AGX Xavier";
 	compatible = "nvidia,p2888", "nvidia,tegra194";
 
 	aliases {