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/gpt.c b/cmd/gpt.c
index c2964d8..05f5f94 100644
--- a/cmd/gpt.c
+++ b/cmd/gpt.c
@@ -794,7 +794,7 @@
  *
  * @return zero on success; otherwise error
  */
-static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_gpt(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	int ret = CMD_RET_SUCCESS;
 	int dev = 0;