ramips: cleanup SPI flash device tree properties usage

Use only the jedec,spi-nor compatible string. Everything else either
never worked or is only support to keep compatibility.

Remove the linux,modalias property. It is obsolete since kernel 4.4.

Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/ramips/dts/MAC1200RV2.dts

@@ -30,9 +30,8 @@
 	m25p80@0 {
 		#address-cells = <1>;
 		#size-cells = <1>;
-		compatible = "w25q128";
+		compatible = "jedec,spi-nor";
 		reg = <0 0>;
-		linux,modalias = "m25p80", "w25q128";
 		spi-max-frequency = <10000000>;
 		m25p,chunked-io = <32>;