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/ubi.c b/cmd/ubi.c
index 54d128d..171377c 100644
--- a/cmd/ubi.c
+++ b/cmd/ubi.c
@@ -528,7 +528,7 @@
 	return 0;
 }
 
-static int do_ubi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_ubi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	int64_t size = 0;
 	ulong addr = 0;