ipq40xx: Use upstream SPI-NAND driver instead of MT29F

Since 4.19 upstream kernel provides generic SPI-NAND
framework and vendor specific drivers.
Since only users of MT29F are 2 boards with Winbond
W25N01GV SPI-NAND for which support has been backported
from 4.20 we can drop the ever stuck in staging MT29F
driver and instead use the upstream driver.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com> [squashed]

target/linux/ipq40xx/config-4.19

@@ -305,10 +305,10 @@ CONFIG_MODULES_USE_ELF_REL=y
 CONFIG_MTD_CMDLINE_PARTS=y
 CONFIG_MTD_M25P80=y
 CONFIG_MTD_NAND=y
+CONFIG_MTD_NAND_CORE=y
 CONFIG_MTD_NAND_ECC=y
 CONFIG_MTD_NAND_QCOM=y
-CONFIG_MTD_SPINAND_MT29F=y
-CONFIG_MTD_SPINAND_ONDIEECC=y
+CONFIG_MTD_SPI_NAND=y
 CONFIG_MTD_SPI_NOR=y
 CONFIG_MTD_SPLIT_FIRMWARE=y
 CONFIG_MTD_SPLIT_FIT_FW=y

target/linux/ipq40xx/files-4.19/arch/arm/boot/dts/qcom-ipq4018-jalapeno.dts

@@ -199,11 +199,11 @@
 		};
 	};
 
-	mt29f@1 {
+	spi-nand@1 {
 		status = "okay";
 		#address-cells = <1>;
 		#size-cells = <0>;
-		compatible = "spinand,mt29f", "w25n01gv";
+		compatible = "spi-nand";
 		reg = <1>;
 		spi-max-frequency = <24000000>;
 		partitions {

target/linux/ipq40xx/files-4.19/arch/arm/boot/dts/qcom-ipq4018-rt-ac58u.dts

@@ -248,10 +248,10 @@
 		};
 	};
 
-	flash@1 {
+	spi-nand@1 {
 		#address-cells = <1>;
 		#size-cells = <0>;
-		compatible = "spinand,mt29f";
+		compatible = "spi-nand";
 		reg = <1>;
 		spi-max-frequency = <24000000>;