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/date.c

@@ -29,7 +29,8 @@ int mk_date (const char *, struct rtc_time *);
 
 static struct rtc_time default_tm = { 0, 0, 0, 1, 1, 2000, 6, 0, 0 };
 
-static int do_date(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_date(struct cmd_tbl *cmdtp, int flag, int argc,
+		   char *const argv[])
 {
 	struct rtc_time tm;
 	int rcode = 0;