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/test/dm/test-main.c b/test/dm/test-main.c
index d7dc8d1f..62a0c69 100644
--- a/test/dm/test-main.c
+++ b/test/dm/test-main.c
@@ -200,7 +200,7 @@
 	return uts->fail_count ? CMD_RET_FAILURE : 0;
 }
 
-int do_ut_dm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_ut_dm(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	const char *test_name = NULL;