ARM: dts: imx: use generic node name for rave-sp

Use generic "mcu" node name for rave-sp node, as recommended by
Devicetree specification.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx51-zii-rdu1.dts

@@ -556,7 +556,7 @@ &uart3 {
 	pinctrl-0 = <&pinctrl_uart3>;
 	status = "okay";
 
-	rave-sp {
+	mcu {
 		compatible = "zii,rave-sp-rdu1";
 		current-speed = <38400>;
 		#address-cells = <1>;

arch/arm/boot/dts/imx51-zii-scu2-mezz.dts

@@ -311,7 +311,7 @@ &uart3 {
 	pinctrl-0 = <&pinctrl_uart3>;
 	status = "okay";
 
-	rave-sp {
+	mcu {
 		compatible = "zii,rave-sp-mezz";
 		current-speed = <57600>;
 		#address-cells = <1>;

arch/arm/boot/dts/imx51-zii-scu3-esb.dts

@@ -319,7 +319,7 @@ &uart3 {
 	pinctrl-0 = <&pinctrl_uart3>;
 	status = "okay";
 
-	rave-sp {
+	mcu {
 		compatible = "zii,rave-sp-esb";
 		current-speed = <57600>;
 		#address-cells = <1>;

arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi

@@ -277,7 +277,7 @@ &uart4 {
 	pinctrl-0 = <&pinctrl_uart4>;
 	status = "okay";
 
-	rave-sp {
+	mcu {
 		compatible = "zii,rave-sp-rdu2";
 		current-speed = <1000000>;
 		#address-cells = <1>;

arch/arm/boot/dts/imx7d-zii-rmu2.dts

@@ -204,7 +204,7 @@ &uart4 {
 	assigned-clock-parents = <&clks IMX7D_PLL_SYS_MAIN_240M_CLK>;
 	status = "okay";
 
-	rave-sp {
+	mcu {
 		compatible = "zii,rave-sp-rdu2";
 		current-speed = <1000000>;
 		#address-cells = <1>;

arch/arm/boot/dts/imx7d-zii-rpu2.dts

@@ -607,7 +607,7 @@ &uart4 {
 	assigned-clock-parents = <&clks IMX7D_PLL_SYS_MAIN_240M_CLK>;
 	status = "okay";
 
-	rave-sp {
+	mcu {
 		compatible = "zii,rave-sp-rdu2";
 		current-speed = <1000000>;
 		#address-cells = <1>;

arch/arm/boot/dts/vf610-zii-spb4.dts

@@ -241,7 +241,7 @@ &uart2 {
 	pinctrl-0 = <&pinctrl_uart2>;
 	status = "okay";
 
-	rave-sp {
+	mcu {
 		compatible = "zii,rave-sp-rdu2";
 		current-speed = <1000000>;
 		#address-cells = <1>;

arch/arm/boot/dts/vf610-zii-ssmb-spu3.dts

@@ -254,7 +254,7 @@ &uart1 {
 	pinctrl-0 = <&pinctrl_uart1>;
 	status = "okay";
 
-	rave-sp {
+	mcu {
 		compatible = "zii,rave-sp-rdu2";
 		current-speed = <1000000>;
 		#address-cells = <1>;