ARM: dts: imx6dl: add compatibles for Aristainetos boards

The Aristainetos and Aristainetos2 boards have only SoC compatible.

Cc: Heiko Schocher <hs@denx.de>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6dl-aristainetos2_4.dts

@@ -46,7 +46,7 @@
 
 / {
 	model = "aristainetos2 i.MX6 Dual Lite Board 4";
-	compatible = "fsl,imx6dl";
+	compatible = "abb,aristainetos2-imx6dl-4", "fsl,imx6dl";
 
 	memory@10000000 {
 		device_type = "memory";

arch/arm/boot/dts/imx6dl-aristainetos2_7.dts

@@ -46,7 +46,7 @@
 
 / {
 	model = "aristainetos2 i.MX6 Dual Lite Board 7";
-	compatible = "fsl,imx6dl";
+	compatible = "abb,aristainetos2-imx6dl-7", "fsl,imx6dl";
 
 	memory@10000000 {
 		device_type = "memory";

arch/arm/boot/dts/imx6dl-aristainetos_4.dts

@@ -10,7 +10,7 @@
 
 / {
 	model = "aristainetos i.MX6 Dual Lite Board 4";
-	compatible = "fsl,imx6dl";
+	compatible = "abb,aristainetos-imx6dl-4", "fsl,imx6dl";
 
 	backlight {
 		compatible = "pwm-backlight";

arch/arm/boot/dts/imx6dl-aristainetos_7.dts

@@ -10,7 +10,7 @@
 
 / {
 	model = "aristainetos i.MX6 Dual Lite Board 7";
-	compatible = "fsl,imx6dl";
+	compatible = "abb,aristainetos-imx6dl-7", "fsl,imx6dl";
 
 	memory@10000000 {
 		device_type = "memory";