ARM: dts: imx50: add ssi dma properties

Replace old ssi dma properties by the generic dma properties.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

arch/arm/boot/dts/imx50.dtsi

@@ -151,8 +151,10 @@ ssi2: ssi@50014000 {
 					reg = <0x50014000 0x4000>;
 					interrupts = <30>;
 					clocks = <&clks IMX5_CLK_SSI2_IPG_GATE>;
+					dmas = <&sdma 24 1 0>,
+					       <&sdma 25 1 0>;
+					dma-names = "rx", "tx";
 					fsl,fifo-depth = <15>;
-					fsl,ssi-dma-events = <25 24 23 22>; /* TX0 RX0 TX1 RX1 */
 					status = "disabled";
 				};
 
@@ -457,8 +459,10 @@ ssi1: ssi@63fcc000 {
 				reg = <0x63fcc000 0x4000>;
 				interrupts = <29>;
 				clocks = <&clks IMX5_CLK_SSI1_IPG_GATE>;
+				dmas = <&sdma 28 0 0>,
+				       <&sdma 29 0 0>;
+				dma-names = "rx", "tx";
 				fsl,fifo-depth = <15>;
-				fsl,ssi-dma-events = <29 28 27 26>; /* TX0 RX0 TX1 RX1 */
 				status = "disabled";
 			};