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/arc/lib/reset.c b/arch/arc/lib/reset.c
index 30dd4b5..fbb56ec 100644
--- a/arch/arc/lib/reset.c
+++ b/arch/arc/lib/reset.c
@@ -13,7 +13,7 @@
 	__builtin_arc_brk();
 }
 
-int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+int do_reset(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	printf("Resetting the board...\n");