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/arch/nds32/lib/boot.c b/arch/nds32/lib/boot.c
index c50e8e5..da2fd36 100644
--- a/arch/nds32/lib/boot.c
+++ b/arch/nds32/lib/boot.c
@@ -9,7 +9,7 @@
 #include <command.h>
 
 unsigned long do_go_exec(ulong (*entry)(int, char * const []),
-			 int argc, char * const argv[])
+			 int argc, char *const argv[])
 {
 	cleanup_before_linux();