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/legacy_led.c b/cmd/legacy_led.c
index 7d40d8d..86cd969 100644
--- a/cmd/legacy_led.c
+++ b/cmd/legacy_led.c
@@ -85,7 +85,7 @@
 {
 }
 
-int do_legacy_led(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_legacy_led(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	int i, match = 0;
 	enum led_cmd cmd;