arm64: dts: lx2160ardb: Update FSPI node properties

Update fspi node compatibles of LX2160A-RDB to "jedec,spi-nor" for
automatic detection of flash.

This also helps in fixing below warning:
spi-nor spi0.0: found mt35xu512aba, expected m25p80
spi-nor spi0.1: found mt35xu512aba, expected m25p80
Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts

@@ -84,7 +84,7 @@ &fspi {
 	mt35xu512aba0: flash@0 {
 		#address-cells = <1>;
 		#size-cells = <1>;
-		compatible = "spansion,m25p80";
+		compatible = "jedec,spi-nor";
 		m25p,fast-read;
 		spi-max-frequency = <50000000>;
 		reg = <0>;
@@ -95,7 +95,7 @@ mt35xu512aba0: flash@0 {
 	mt35xu512aba1: flash@1 {
 		#address-cells = <1>;
 		#size-cells = <1>;
-		compatible = "spansion,m25p80";
+		compatible = "jedec,spi-nor";
 		m25p,fast-read;
 		spi-max-frequency = <50000000>;
 		reg = <1>;