ARM: dts: at91: Avoid colliding 'display' node and property names

While properties and child nodes with the same name are valid DT, the
practice is not encouraged. Furthermore, the collision is problematic for
YAML encoded DT. Let's just avoid the issue and rename the nodes.

Signed-off-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Acked-by: Nicolas Ferre <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>

arch/arm/boot/dts/at91sam9261ek.dts

···
 			atmel,power-control-gpio = <&pioA 12 GPIO_ACTIVE_LOW>;
 			status = "okay";
 
-			display0: display {
+			display0: panel {
 				bits-per-pixel = <16>;
 				atmel,lcdcon-backlight;
 				atmel,dmacon = <0x1>;

arch/arm/boot/dts/at91sam9263ek.dts

···
 			display = <&display0>;
 			status = "okay";
 
-			display0: display {
+			display0: panel {
 				bits-per-pixel = <16>;
 				atmel,lcdcon-backlight;
 				atmel,dmacon = <0x1>;

arch/arm/boot/dts/at91sam9m10g45ek.dts

···
 			display = <&display0>;
 			status = "okay";
 
-			display0: display {
+			display0: panel {
 				bits-per-pixel = <32>;
 				atmel,lcdcon-backlight;
 				atmel,dmacon = <0x1>;

arch/arm/boot/dts/at91sam9rlek.dts

···
 			display = <&display0>;
 			status = "okay";
 
-			display0: display {
+			display0: panel {
 				bits-per-pixel = <16>;
 				atmel,lcdcon-backlight;
 				atmel,dmacon = <0x1>;