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>

include/net.h

@@ -22,7 +22,7 @@
 #include <rand.h>
 
 struct bd_info;
-struct cmd_tbl_s;
+struct cmd_tbl;
 struct udevice;
 
 #define DEBUG_LL_STATE 0	/* Link local state machine changes */
@@ -66,7 +66,7 @@ struct in_addr {
  * @argv: List of arguments
  * @return result (see enum command_ret_t)
  */
-int do_tftpb(struct cmd_tbl_s *cmdtp, int flag, int argc, char *const argv[]);
+int do_tftpb(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
 
 /**
  * An incoming packet handler.