arm64: dts: mediatek: mt7986: fix SPI bus width properties

This fixes SPI setup and resolves following validation errors:
arch/arm64/boot/dts/mediatek/mt7986a-rfb.dtb: spi_nand@0: Unevaluated properties are not allowed ('spi-rx-buswidth', 'spi-tx-buswidth' were unexpected)
        from schema $id: http://devicetree.org/schemas/mtd/spi-nand.yaml#
arch/arm64/boot/dts/mediatek/mt7986b-rfb.dtb: spi_nand@0: Unevaluated properties are not allowed ('spi-rx-buswidth', 'spi-tx-buswidth' were unexpected)
        from schema $id: http://devicetree.org/schemas/mtd/spi-nand.yaml#

Fixes: 885e153e ("arm64: dts: mt7986: add spi related device nodes")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20231116130952.5099-1-zajec5@gmail.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

arch/arm64/boot/dts/mediatek/mt7986a-rfb.dts

@@ -241,8 +241,8 @@ spi_nand: spi_nand@0 {
 		compatible = "spi-nand";
 		reg = <0>;
 		spi-max-frequency = <10000000>;
-		spi-tx-buswidth = <4>;
-		spi-rx-buswidth = <4>;
+		spi-tx-bus-width = <4>;
+		spi-rx-bus-width = <4>;
 	};
 };
 

arch/arm64/boot/dts/mediatek/mt7986b-rfb.dts

@@ -156,8 +156,8 @@ spi_nand: spi_nand@0 {
 		compatible = "spi-nand";
 		reg = <0>;
 		spi-max-frequency = <10000000>;
-		spi-tx-buswidth = <4>;
-		spi-rx-buswidth = <4>;
+		spi-tx-bus-width = <4>;
+		spi-rx-bus-width = <4>;
 	};
 };