ARM: mxs: add mxs-dma dt support

Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Huang Shijie <b32955@freescale.com>
Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Vinod Koul <vinod.koul@intel.com>

arch/arm/boot/dts/imx23.dtsi

@@ -42,8 +42,8 @@
 			};
 
 			dma-apbh@80004000 {
+				compatible = "fsl,imx23-dma-apbh";
 				reg = <0x80004000 2000>;
-				status = "disabled";
 			};
 
 			ecc@80008000 {
@@ -97,8 +97,8 @@
 			};
 
 			dma-apbx@80024000 {
+				compatible = "fsl,imx23-dma-apbx";
 				reg = <0x80024000 2000>;
-				status = "disabled";
 			};
 
 			dcp@80028000 {

arch/arm/boot/dts/imx28.dtsi

@@ -48,8 +48,8 @@
 			};
 
 			dma-apbh@80004000 {
+				compatible = "fsl,imx28-dma-apbh";
 				reg = <0x80004000 2000>;
-				status = "disabled";
 			};
 
 			perfmon@80006000 {
@@ -140,8 +140,8 @@
 			};
 
 			dma-apbx@80024000 {
+				compatible = "fsl,imx28-dma-apbx";
 				reg = <0x80024000 2000>;
-				status = "disabled";
 			};
 
 			dcp@80028000 {