command_t: punt unused type

The recent command clean up to constify the argv option to command funcs
missed the command_t type itself.  This is probably because there are no
build time warnings from it because no one is actually using this thing.
So just punt it rather than fix it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

include/command.h

@@ -86,8 +86,6 @@ extern int cmd_auto_complete(const char *const prompt, char *buf, int *np, int *
  * void function (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
  */
 
-typedef	void	command_t (cmd_tbl_t *, int, int, char *[]);
-
 #if defined(CONFIG_CMD_MEMORY)		\
     || defined(CONFIG_CMD_I2C)		\
     || defined(CONFIG_CMD_ITEST)	\