ARM: at91/dt: sama5d4 xplained: add spi1 on j14 connector

Route SPI1 on the Arduino "in the middle" spi connector.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91-sama5d4_xplained.dts

@@ -122,6 +122,11 @@ usart4: serial@fc010000 {
 				status = "okay";
 			};
 
+			spi1: spi@fc018000 {
+				cs-gpios = <&pioB 21 0>;
+				status = "okay";
+			};
+
 			adc0: adc@fc034000 {
 				atmel,adc-vref = <3300>;
 				status = "okay";