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/board/freescale/t4rdb/cpld.c b/board/freescale/t4rdb/cpld.c
index 470b5f9..d484509 100644
--- a/board/freescale/t4rdb/cpld.c
+++ b/board/freescale/t4rdb/cpld.c
@@ -95,7 +95,7 @@
 #endif
 
 #ifndef CONFIG_SPL_BUILD
-int do_cpld(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_cpld(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	int rc = 0;