bootstd: Fix incorrect struct name in bootmeth_setup_iter_order()

There is no such thing as struct bootmeth, it's probably a typo. This
issue doesn't affect the execution as it's a pointer, and pointer sizes
are the same for all data types. But it can be confusing, so make it
struct udevice, as it should be.

Fixes: a950d31abe ("bootstd: Add the bootmeth uclass and helpers")
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>

boot/bootmeth-uclass.c

@@ -141,7 +141,7 @@ int bootmeth_setup_iter_order(struct bootflow_iter *iter, bool include_global)
 			goto err_order;
 		}
 		memcpy(order, std->bootmeth_order,
-		       count * sizeof(struct bootmeth *));
+		       count * sizeof(struct udevice *));
 
 		if (IS_ENABLED(CONFIG_BOOTMETH_GLOBAL)) {
 			for (i = 0; i < count; i++) {