ARM: dts: at91: sama5d3_xplained: not all ADC channels are available

Remove ADC channels that are not available by default on the sama5d3_xplained
board (resistor not populated) in order to not create confusion.
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: <stable@vger.kernel.org> # 3.16+
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/boot/dts/at91-sama5d3_xplained.dts

@@ -163,9 +163,9 @@ spi1: spi@f8008000 {
 
 			adc0: adc@f8018000 {
 				atmel,adc-vref = <3300>;
+				atmel,adc-channels-used = <0xfe>;
 				pinctrl-0 = <
 					&pinctrl_adc0_adtrg
-					&pinctrl_adc0_ad0
 					&pinctrl_adc0_ad1
 					&pinctrl_adc0_ad2
 					&pinctrl_adc0_ad3
@@ -173,8 +173,6 @@ &pinctrl_adc0_ad4
 					&pinctrl_adc0_ad5
 					&pinctrl_adc0_ad6
 					&pinctrl_adc0_ad7
-					&pinctrl_adc0_ad8
-					&pinctrl_adc0_ad9
 					>;
 				status = "okay";
 			};