arm64: dts: apple: Add chassis-type property for Mac Pro

"server" is a better fit for the Mac Pro than "desktop" because tower
and rack-mount version are using the same DT.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

arch/arm64/boot/dts/apple/t6022-j180d.dts

@@ -16,6 +16,8 @@
 / {
 	compatible = "apple,j180d", "apple,t6022", "apple,arm-platform";
 	model = "Apple Mac Pro (M2 Ultra, 2023)";
+	chassis-type = "server";
+
 	aliases {
 		atcphy0 = &atcphy0;
 		atcphy1 = &atcphy1;