arm64: dts: mt7622: declare SPI-NAND present on BPI-R64

The SPI-NOR node in the device tree of the BananaPi R64 has most likely
been copied from the reference board's device tree even though the R64
comes with an SPI-NAND chip rather than SPI-NOR.

Setup the Serial NAND Flash Interface (SNFI) controller, enable
hardware BCH error detection and correction engine and add the SPI-NAND
chip including basic partitions,
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Link: https://lore.kernel.org/r/ZEA96dmaXqTpk8u8@makrotopia.orgSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts

@@ -248,14 +248,42 @@ &nandc {
 	status = "disabled";
 };
 
-&nor_flash {
-	pinctrl-names = "default";
-	pinctrl-0 = <&spi_nor_pins>;
-	status = "disabled";
+&bch {
+	status = "okay";
+};
 
+&snfi {
+	pinctrl-names = "default";
+	pinctrl-0 = <&serial_nand_pins>;
+	status = "okay";
 	flash@0 {
-		compatible = "jedec,spi-nor";
+		compatible = "spi-nand";
 		reg = <0>;
+		spi-tx-bus-width = <4>;
+		spi-rx-bus-width = <4>;
+		nand-ecc-engine = <&snfi>;
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "bl2";
+				reg = <0x0 0x80000>;
+				read-only;
+			};
+
+			partition@80000 {
+				label = "fip";
+				reg = <0x80000 0x200000>;
+				read-only;
+			};
+
+			ubi: partition@280000 {
+				label = "ubi";
+				reg = <0x280000 0x7d80000>;
+			};
+		};
 	};
 };