Remove references to CONFIG_CMD_EXT3, no such command

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>

include/configs/colibri_vf.h

@@ -72,7 +72,6 @@
 #define CONFIG_CMD_MMC
 #define CONFIG_GENERIC_MMC
 #define CONFIG_CMD_FAT
-#define CONFIG_CMD_EXT3
 #define CONFIG_CMD_EXT4
 #define CONFIG_DOS_PARTITION
 

include/configs/legoev3.h

@@ -240,7 +240,6 @@
  */
 #ifdef CONFIG_MMC
 #define CONFIG_DOS_PARTITION
-#define CONFIG_CMD_EXT3
 #define CONFIG_CMD_EXT4
 #define CONFIG_CMD_FAT
 #define CONFIG_CMD_MMC