dt-bindings: 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]>
Acked-by: Mark Brown <[e-mail]>
Reviewed-by: Miquel Raynal <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/mtd/hisilicon,fmc-spi-nor.txt

···
 	reg = <0x10000000 0x1000>, <0x14000000 0x1000000>;
 	reg-names = "control", "memory";
 	clocks = <&clock HI3519_FMC_CLK>;
-	spi-nor@0 {
+	flash@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0>;
 	};

Documentation/devicetree/bindings/spi/spi-davinci.txt

···
 	interrupts			= <338>;
 	clocks				= <&clkspi>;
 
-	flash: n25q032@0 {
+	flash: flash@0 {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		compatible = "st,m25p32";

Documentation/devicetree/bindings/spi/spi-pl022.yaml

···
         <&dma_controller 24 0>;
       dma-names = "rx", "tx";
 
-      m25p80@1 {
+      flash@1 {
         compatible = "st,m25p80";
         reg = <1>;
         spi-max-frequency = <12000000>;