arm64: dts: apple: Add chassis-type property for Apple iMacs

Apple iMac (M1, 2021) are all-in-one devices which have an integrated
display.

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

Author: jannau

arch/arm64/boot/dts/apple/t8103-j456.dts

@@ -15,6 +15,7 @@
 / {
 	compatible = "apple,j456", "apple,t8103", "apple,arm-platform";
 	model = "Apple iMac (24-inch, 4x USB-C, M1, 2021)";
+	chassis-type = "all-in-one";
 
 	aliases {
 		ethernet0 = &ethernet0;

arch/arm64/boot/dts/apple/t8103-j457.dts

@@ -15,6 +15,7 @@
 / {
 	compatible = "apple,j457", "apple,t8103", "apple,arm-platform";
 	model = "Apple iMac (24-inch, 2x USB-C, M1, 2021)";
+	chassis-type = "all-in-one";
 
 	aliases {
 		ethernet0 = &ethernet0;