VCMA9: remove EXT2 support

remove the seldomly used EXT2 support because the U-Boot binary will
not fit into the 512KiB flash otherwise.

Signed-off-by: David Müller <d.mueller@elsoft.ch>

include/configs/VCMA9.h

@@ -216,7 +216,6 @@
 
 /* File system */
 #define CONFIG_CMD_FAT
-#define CONFIG_CMD_EXT2
 #define CONFIG_CMD_UBI
 #define CONFIG_CMD_UBIFS
 #define CONFIG_CMD_JFFS2