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/wol.c b/cmd/wol.c
index 8a756f3..f0d6343 100644
--- a/cmd/wol.c
+++ b/cmd/wol.c
@@ -14,7 +14,7 @@
 #if defined(CONFIG_CMD_WOL)
 void wol_set_timeout(ulong);
 
-int do_wol(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_wol(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	/* Validate arguments */
 	if (argc < 2)