ARM: dts: socfpga: align SPI NOR node name with dtschema

The node names should be generic and SPI NOR dtschema expects "flash".

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Dinh Nguyen <[e-mail]>

arch/arm/boot/dts/socfpga_arria10_socdk_qspi.dts

···
 &qspi {
 	status = "okay";
 
-	flash0: n25q00@0 {
+	flash0: flash@0 {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		compatible = "micron,mt25qu02g", "jedec,spi-nor";

arch/arm/boot/dts/socfpga_cyclone5_socdk.dts

···
 &qspi {
 	status = "okay";
 
-	flash0: n25q00@0 {
+	flash0: flash@0 {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		compatible = "micron,mt25qu02g", "jedec,spi-nor";

arch/arm/boot/dts/socfpga_cyclone5_sodia.dts

···
 &qspi {
 	status = "okay";
 
-	flash0: n25q512a@0 {
+	flash0: flash@0 {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		compatible = "micron,n25q512a", "jedec,spi-nor";

arch/arm/boot/dts/socfpga_cyclone5_vining_fpga.dts

···
 &qspi {
 	status = "okay";
 
-	n25q128@0 {
+	flash@0 {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		compatible = "micron,n25q128", "jedec,spi-nor";
···
 		cdns,tslch-ns = <4>;
 	};
 
-	n25q00@1 {
+	flash@1 {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		compatible = "micron,mt25qu02g", "jedec,spi-nor";