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/include/blk.h b/include/blk.h
index 6f541bb..abcd4be 100644
--- a/include/blk.h
+++ b/include/blk.h
@@ -679,7 +679,7 @@
  * @cur_devnump: Current device number for this interface type
  * @return 0 if OK, CMD_RET_ERROR on error
  */
-int blk_common_cmd(int argc, char * const argv[], enum if_type if_type,
+int blk_common_cmd(int argc, char *const argv[], enum if_type if_type,
 		   int *cur_devnump);
 
 #endif