mtd: rawnand: Change Kconfig titles and re-order a bit the list

This list is a mess, while some items should probably not be in the
raw/ sub-directory, others are definitely at the right place but not
with the right description. Write uniform titles and group IPs by
vendor.

NAND controllers will appear under the list named "Raw/parallel NAND
flash controllers" while the other drivers will appear under
"Misc". Software ECC engines will later be moved out of the raw/
directory.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

drivers/mtd/nand/raw/ingenic/Kconfig

 config MTD_NAND_JZ4740
-	tristate "Support for JZ4740 SoC NAND controller"
+	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 "Support for NAND on JZ4780 SoC"
+	tristate "JZ4780 NAND controller"
 	depends on JZ4780_NEMC
 	help
 	  Enables support for NAND Flash connected to the NEMC on JZ4780 SoC