command: Remove the cmd_tbl_t typedef

We should not use typedefs in U-Boot. They cannot be used as forward
declarations which means that header files must include the full header to
access them.

Drop the typedef and rename the struct to remove the _s suffix which is
now not useful.

This requires quite a few header-file additions.

Signed-off-by: Simon Glass <sjg@chromium.org>

cmd/mvebu/bubt.c

@@ -829,7 +829,7 @@ else
 #endif
 #endif /* DEFAULT_BUBT_DST */
 
-int do_bubt_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_bubt_cmd(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	struct bubt_dev *src, *dst;
 	size_t image_size;