dm: implement a MTD uclass

Implement a Memory Technology Device (MTD) uclass. It should
include most flash drivers in the future. Though no uclass ops
are defined yet, the MTD ops could be used.

The NAND flash driver is based on MTD. The CFI flash and SPI
flash support MTD, too. It should make sense to convert them
to MTD uclass.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>

include/linux/mtd/mtd.h

@@ -272,6 +272,8 @@ struct mtd_info {
 	struct module *owner;
 #ifndef __UBOOT__
 	struct device dev;
+#else
+	struct udevice *dev;
 #endif
 	int usecount;
 };