mtd: move NAND files into a raw/ subdirectory

NAND flavors, like serial and parallel, have a lot in common and would
benefit to share code. Let's move raw (parallel) NAND specific code in a
raw/ subdirectory, to ease the addition of a core file in nand/ and the
introduction of a spi/ subdirectory specific to SPI NANDs.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 64fb41e..20a0a5e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -298,7 +298,7 @@
 F:	drivers/i2c/muxes/pca954x.c
 F:	drivers/i2c/zynq_i2c.c
 F:	drivers/mmc/zynq_sdhci.c
-F:	drivers/mtd/nand/zynq_nand.c
+F:	drivers/mtd/nand/raw/zynq_nand.c
 F:	drivers/net/phy/xilinx_phy.c
 F:	drivers/net/zynq_gem.c
 F:	drivers/serial/serial_zynq.c
@@ -322,7 +322,7 @@
 F:	drivers/i2c/muxes/pca954x.c
 F:	drivers/i2c/zynq_i2c.c
 F:	drivers/mmc/zynq_sdhci.c
-F:	drivers/mtd/nand/zynq_nand.c
+F:	drivers/mtd/nand/raw/zynq_nand.c
 F:	drivers/net/phy/xilinx_phy.c
 F:	drivers/net/zynq_gem.c
 F:	drivers/serial/serial_zynq.c
@@ -467,7 +467,7 @@
 #M:	Scott Wood <oss@buserror.net>
 S:	Orphaned (Since 2018-07)
 T:	git git://git.denx.de/u-boot-nand-flash.git
-F:	drivers/mtd/nand/
+F:	drivers/mtd/nand/raw/
 
 NDS32
 M:	Macpaul Lin <macpaul@andestech.com>