Block: Remove MG DISK support

This driver is unused and obsolete.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: unsik Kim <donari75@gmail.com>
diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index 2712002..fd05e72 100644
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -59,7 +59,6 @@
 #if	!defined(CONFIG_ENV_IS_IN_EEPROM)	&& \
 	!defined(CONFIG_ENV_IS_IN_FLASH)	&& \
 	!defined(CONFIG_ENV_IS_IN_DATAFLASH)	&& \
-	!defined(CONFIG_ENV_IS_IN_MG_DISK)	&& \
 	!defined(CONFIG_ENV_IS_IN_MMC)		&& \
 	!defined(CONFIG_ENV_IS_IN_FAT)		&& \
 	!defined(CONFIG_ENV_IS_IN_NAND)		&& \
@@ -69,7 +68,7 @@
 	!defined(CONFIG_ENV_IS_IN_REMOTE)	&& \
 	!defined(CONFIG_ENV_IS_NOWHERE)
 # error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|DATAFLASH|ONENAND|\
-SPI_FLASH|MG_DISK|NVRAM|MMC|FAT|REMOTE} or CONFIG_ENV_IS_NOWHERE
+SPI_FLASH|NVRAM|MMC|FAT|REMOTE} or CONFIG_ENV_IS_NOWHERE
 #endif
 
 #define XMK_STR(x)	#x