payload_utils: Change all imports from "bindings" to "config".

- Make all imports consistent.

BUG=None
TEST=CQ

Change-Id: I036caa6be8214d625d4976bab841f7617a585020
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/config/+/2145033
Reviewed-by: David Burger <dburger@chromium.org>
Commit-Queue: Andrew Lamb <andrewlamb@chromium.org>
Tested-by: Andrew Lamb <andrewlamb@chromium.org>
diff --git a/payload_utils/checker/io_utils.py b/payload_utils/checker/io_utils.py
index a1f708a..8530509 100644
--- a/payload_utils/checker/io_utils.py
+++ b/payload_utils/checker/io_utils.py
@@ -5,7 +5,7 @@
 
 import os
 
-from bindings.payload import config_bundle_pb2
+from config.payload import config_bundle_pb2
 
 
 def read_config(path: str) -> config_bundle_pb2.ConfigBundle: