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/rockusb.c b/cmd/rockusb.c
index 9b70c6a..f181ec6 100644
--- a/cmd/rockusb.c
+++ b/cmd/rockusb.c
@@ -10,7 +10,8 @@
 #include <usb.h>
 #include <asm/arch-rockchip/f_rockusb.h>
 
-static int do_rockusb(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+static int do_rockusb(struct cmd_tbl *cmdtp, int flag, int argc,
+		      char *const argv[])
 {
 	int controller_index, dev_index;
 	char *usb_controller;