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/zip.c b/cmd/zip.c
index 8ef46e9..b433f18 100644
--- a/cmd/zip.c
+++ b/cmd/zip.c
@@ -8,7 +8,7 @@
 #include <command.h>
 #include <env.h>
 
-static int do_zip(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_zip(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	unsigned long src, dst;
 	unsigned long src_len, dst_len = ~0UL;