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/dataflash_mmc_mux.c b/cmd/dataflash_mmc_mux.c
index 9f271b6..73876e9 100644
--- a/cmd/dataflash_mmc_mux.c
+++ b/cmd/dataflash_mmc_mux.c
@@ -9,7 +9,8 @@
 
 static int mmc_nspi (const char *);
 
-int do_dataflash_mmc_mux (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_dataflash_mmc_mux(struct cmd_tbl *cmdtp, int flag, int argc,
+			 char *const argv[])
 {
 	switch (argc) {
 	case 2:			/* on / off	*/