mtd: rawnand: Drop obsolete JZ4740 NAND driver

It has been replaced with the newer Ingenic NAND driver.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>

drivers/mtd/nand/raw/ingenic/Kconfig

 # SPDX-License-Identifier: GPL-2.0-only
-config MTD_NAND_JZ4740
-	tristate "JZ4740 NAND controller"
-	depends on MACH_JZ4740 || COMPILE_TEST
-	depends on HAS_IOMEM
-	help
-	  Enables support for NAND Flash on JZ4740 SoC based boards.
-
 config MTD_NAND_JZ4780
 	tristate "JZ4780 NAND controller"
 	depends on JZ4780_NEMC

drivers/mtd/nand/raw/ingenic/Makefile

 # SPDX-License-Identifier: GPL-2.0-only
-obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
 obj-$(CONFIG_MTD_NAND_JZ4780) += ingenic_nand.o
 
 ingenic_nand-y += ingenic_nand_drv.o