ARM: dts: at91: sama5d2: Add DMA bindings for the SPI and I2C flx0 functions

Spare boards of duplicating the DMA bindings. Describe the flx0
DMA bindings in the SoC dtsi. Users that don't want to use DMA
for their flexcom functions have to overwrite the flexcom DMA
bindings in their board device tree.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20200514050301.147442-12-tudor.ambarus@microchip.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
diff --git a/arch/arm/boot/dts/at91-sama5d2_icp.dts b/arch/arm/boot/dts/at91-sama5d2_icp.dts
index 559d8ae..8d19925 100644
--- a/arch/arm/boot/dts/at91-sama5d2_icp.dts
+++ b/arch/arm/boot/dts/at91-sama5d2_icp.dts
@@ -105,6 +105,7 @@ &flx0 { /* mikrobus2 spi */
 	status = "okay";
 
 	spi2: spi@400 {
+		dmas = <0>, <0>;
 		cs-gpios = <&pioA PIN_PC0 GPIO_ACTIVE_LOW>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_mikrobus2_spi &pinctrl_ksz_spi_cs>;