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/md5sum.c b/cmd/md5sum.c
index 4e30334..5ae3ddf 100644
--- a/cmd/md5sum.c
+++ b/cmd/md5sum.c
@@ -73,7 +73,7 @@
 	return 0;
 }
 
-int do_md5sum(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_md5sum(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	ulong addr, len;
 	unsigned int i;
@@ -136,7 +136,8 @@
 	return 0;
 }
 #else
-static int do_md5sum(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_md5sum(struct cmd_tbl *cmdtp, int flag, int argc,
+		     char *const argv[])
 {
 	unsigned long addr, len;
 	unsigned int i;