board: at91sam9263ek: Use SPI-flash-based AT45xxx DataFlash

To support driver model and device tree, use the SPI-flash-based
AT45xxx DataFlash driver, DataFlash is a kind of SPI flash.
Instead of ATMEL_DATAFLASH_SPI DataFlash older driver that will
be removed in the future.

Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/at91sam9263.dtsi b/arch/arm/dts/at91sam9263.dtsi
index e899fd3..0b594be 100644
--- a/arch/arm/dts/at91sam9263.dtsi
+++ b/arch/arm/dts/at91sam9263.dtsi
@@ -32,6 +32,7 @@
 		ssc0 = &ssc0;
 		ssc1 = &ssc1;
 		pwm0 = &pwm0;
+		spi0 = &spi0;
 	};
 
 	cpus {