ARM: at91: dts: add adc resolution stuff

Add the ADC low and high resolution configuration and which one to use.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91sam9260.dtsi

@@ -484,6 +484,9 @@
 				atmel,adc-drdy-mask = <0x10000>;
 				atmel,adc-status-register = <0x1c>;
 				atmel,adc-trigger-register = <0x04>;
+				atmel,adc-res = <8 10>;
+				atmel,adc-res-names = "lowres", "highres";
+				atmel,adc-use-res = "highres";
 
 				trigger@0 {
 					trigger-name = "timer-counter-0";

arch/arm/boot/dts/at91sam9g45.dtsi

@@ -484,6 +484,9 @@
 				atmel,adc-drdy-mask = <0x10000>;
 				atmel,adc-status-register = <0x1c>;
 				atmel,adc-trigger-register = <0x08>;
+				atmel,adc-res = <8 10>;
+				atmel,adc-res-names = "lowres", "highres";
+				atmel,adc-use-res = "highres";
 
 				trigger@0 {
 					trigger-name = "external-rising";

arch/arm/boot/dts/at91sam9x5.dtsi

@@ -535,6 +535,9 @@
 				atmel,adc-drdy-mask = <0x1000000>;
 				atmel,adc-status-register = <0x30>;
 				atmel,adc-trigger-register = <0xc0>;
+				atmel,adc-res = <8 10>;
+				atmel,adc-res-names = "lowres", "highres";
+				atmel,adc-use-res = "highres";
 
 				trigger@0 {
 					trigger-name = "external-rising";