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/itest.c

@@ -175,7 +175,8 @@ static int binary_test(char *op, char *arg1, char *arg2, int w)
 }
 
 /* command line interface to the shell test */
-static int do_itest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_itest(struct cmd_tbl *cmdtp, int flag, int argc,
+		    char *const argv[])
 {
 	int	value, w;