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/board/BuS/eb_cpu5282/eb_cpu5282.c b/board/BuS/eb_cpu5282/eb_cpu5282.c
index a667413..1d05e40 100644
--- a/board/BuS/eb_cpu5282/eb_cpu5282.c
+++ b/board/BuS/eb_cpu5282/eb_cpu5282.c
@@ -226,7 +226,7 @@
 /*---------------------------------------------------------------------------*/
 
 #ifdef CONFIG_VIDEO
-int do_brightness(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_brightness(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	int rcode = 0;
 	ulong side;