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/diag.c b/cmd/diag.c
index 8d21c7d..f51536d 100644
--- a/cmd/diag.c
+++ b/cmd/diag.c
@@ -11,7 +11,7 @@
 #include <command.h>
 #include <post.h>
 
-int do_diag (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
+int do_diag(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	unsigned int i;