ARM: dts: imx: Change sdhci node name on i.MX27/i.MX31 SoCs

Change i.MX27/i.MX31 node name from sdhci to mmc to be compliant
with yaml schema, it requires the nodename to be "mmc".
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx27.dtsi

@@ -265,7 +265,7 @@ i2c1: i2c@10012000 {
 				status = "disabled";
 			};
 
-			sdhci1: sdhci@10013000 {
+			sdhci1: mmc@10013000 {
 				compatible = "fsl,imx27-mmc", "fsl,imx21-mmc";
 				reg = <0x10013000 0x1000>;
 				interrupts = <11>;
@@ -277,7 +277,7 @@ sdhci1: sdhci@10013000 {
 				status = "disabled";
 			};
 
-			sdhci2: sdhci@10014000 {
+			sdhci2: mmc@10014000 {
 				compatible = "fsl,imx27-mmc", "fsl,imx21-mmc";
 				reg = <0x10014000 0x1000>;
 				interrupts = <10>;
@@ -431,7 +431,7 @@ i2c2: i2c@1001d000 {
 				status = "disabled";
 			};
 
-			sdhci3: sdhci@1001e000 {
+			sdhci3: mmc@1001e000 {
 				compatible = "fsl,imx27-mmc", "fsl,imx21-mmc";
 				reg = <0x1001e000 0x1000>;
 				interrupts = <9>;

arch/arm/boot/dts/imx31.dtsi

@@ -173,7 +173,7 @@ spba@50000000 {
 			reg = <0x50000000 0x100000>;
 			ranges;
 
-			sdhci1: sdhci@50004000 {
+			sdhci1: mmc@50004000 {
 				compatible = "fsl,imx31-mmc";
 				reg = <0x50004000 0x4000>;
 				interrupts = <9>;
@@ -184,7 +184,7 @@ sdhci1: sdhci@50004000 {
 				status = "disabled";
 			};
 
-			sdhci2: sdhci@50008000 {
+			sdhci2: mmc@50008000 {
 				compatible = "fsl,imx31-mmc";
 				reg = <0x50008000 0x4000>;
 				interrupts = <8>;