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>
diff --git a/cmd/cls.c b/cmd/cls.c
index f1ce6e8..eab4e69 100644
--- a/cmd/cls.c
+++ b/cmd/cls.c
@@ -11,7 +11,7 @@
 #include <lcd.h>
 #include <video.h>
 
-static int do_video_clear(cmd_tbl_t *cmdtp, int flag, int argc,
+static int do_video_clear(struct cmd_tbl *cmdtp, int flag, int argc,
 			  char *const argv[])
 {
 #if defined(CONFIG_DM_VIDEO)