arm64: dts: imx8m*-tqma8m*: Add chassis-type

Device tree specification 0.4 defines an optional, but recommended
'chassis-type' property. Add it to TQMa8M* based board files.
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml-mba8mx.dts

@@ -11,6 +11,7 @@
 / {
 	model = "TQ-Systems GmbH i.MX8MM TQMa8MxML on MBa8Mx";
 	compatible = "tq,imx8mm-tqma8mqml-mba8mx", "tq,imx8mm-tqma8mqml", "fsl,imx8mm";
+	chassis-type = "embedded";
 
 	aliases {
 		eeprom0 = &eeprom3;

arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl-mba8mx.dts

@@ -11,6 +11,7 @@
 / {
 	model = "TQ-Systems GmbH i.MX8MN TQMa8MxNL on MBa8Mx";
 	compatible = "tq,imx8mn-tqma8mqnl-mba8mx", "tq,imx8mn-tqma8mqnl", "fsl,imx8mn";
+	chassis-type = "embedded";
 
 	aliases {
 		eeprom0 = &eeprom3;

arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql-mba8mpxl.dts

@@ -15,6 +15,7 @@
 / {
 	model = "TQ-Systems i.MX8MPlus TQMa8MPxL on MBa8MPxL";
 	compatible = "tq,imx8mp-tqma8mpql-mba8mpxl", "tq,imx8mp-tqma8mpql", "fsl,imx8mp";
+	chassis-type = "embedded";
 
 	chosen {
 		stdout-path = &uart4;

arch/arm64/boot/dts/freescale/imx8mq-tqma8mq-mba8mx.dts

@@ -11,6 +11,7 @@
 / {
 	model = "TQ-Systems GmbH i.MX8MQ TQMa8MQ on MBa8Mx";
 	compatible = "tq,imx8mq-tqma8mq-mba8mx", "tq,imx8mq-tqma8mq", "fsl,imx8mq";
+	chassis-type = "embedded";
 
 	aliases {
 		eeprom0 = &eeprom3;