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/drivers/net/vsc9953.c b/drivers/net/vsc9953.c
index f17839c..93eb2b1 100644
--- a/drivers/net/vsc9953.c
+++ b/drivers/net/vsc9953.c
@@ -5,6 +5,7 @@
  *  Driver for the Vitesse VSC9953 L2 Switch
  */
 
+#include <command.h>
 #include <asm/io.h>
 #include <asm/fsl_serdes.h>
 #include <fm_eth.h>