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/read.c b/cmd/read.c
index 7977e9d..34f53f9 100644
--- a/cmd/read.c
+++ b/cmd/read.c
@@ -12,7 +12,7 @@
 #include <command.h>
 #include <part.h>
 
-int do_read(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_read(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	char *ep;
 	struct blk_desc *dev_desc = NULL;