ARM: dts: sirf: move to use generic dma dt-binding for spi

in drivers/spi/spi-sirf.c, we have moved to use generic dma dt-binding.
here the dts should be changed too.

Cc: Mark Brown <broonie@linaro.org>
Signed-off-by: Barry Song <Baohua.Song@csr.com>

arch/arm/boot/dts/atlas6.dtsi

@@ -297,9 +297,9 @@
 				reg = <0xb00d0000 0x10000>;
 				interrupts = <15>;
 				sirf,spi-num-chipselects = <1>;
-				cs-gpios = <&gpio 0 0>;
-				sirf,spi-dma-rx-channel = <25>;
-				sirf,spi-dma-tx-channel = <20>;
+				dmas = <&dmac1 9>,
+				     <&dmac1 4>;
+				dma-names = "rx", "tx";
 				#address-cells = <1>;
 				#size-cells = <0>;
 				clocks = <&clks 19>;
@@ -312,8 +312,9 @@
 				reg = <0xb0170000 0x10000>;
 				interrupts = <16>;
 				sirf,spi-num-chipselects = <1>;
-				sirf,spi-dma-rx-channel = <12>;
-				sirf,spi-dma-tx-channel = <13>;
+				dmas = <&dmac0 12>,
+				     <&dmac0 13>;
+				dma-names = "rx", "tx";
 				#address-cells = <1>;
 				#size-cells = <0>;
 				clocks = <&clks 20>;