rename CONFIG_CMD_ENV to CONFIG_CMD_SAVEENV

The CONFIG_CMD_ENV option controls enablement of the `saveenv` command
rather than a generic "env" command, or anything else related to the
environment.  So, let's make sure the define is named accordingly.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/include/config_cmd_all.h b/include/config_cmd_all.h
index d771696..205dd1f 100644
--- a/include/config_cmd_all.h
+++ b/include/config_cmd_all.h
@@ -33,7 +33,7 @@
 #define CONFIG_CMD_ECHO		/* echo arguments		*/
 #define CONFIG_CMD_EEPROM	/* EEPROM read/write support	*/
 #define CONFIG_CMD_ELF		/* ELF (VxWorks) load/boot cmd	*/
-#define CONFIG_CMD_ENV		/* saveenv			*/
+#define CONFIG_CMD_SAVEENV	/* saveenv			*/
 #define CONFIG_CMD_EXT2		/* EXT2 Support			*/
 #define CONFIG_CMD_FAT		/* FAT support			*/
 #define CONFIG_CMD_FDC		/* Floppy Disk Support		*/