Write the packaged USB gadget app in binary mode.

tools/usb_gadget/package.py

Index: tools/usb_gadget/package.py
diff --git a/tools/usb_gadget/package.py b/tools/usb_gadget/package.py
index 069bb1477d7738e8d6a3f3152c430aed5c37c089..1c5003325662acc715c1dc9463675c2cfde0e554 100755
--- a/tools/usb_gadget/package.py
+++ b/tools/usb_gadget/package.py
@@ -82,10 +82,10 @@ def main():
 
   content, md5 = MakeZip(directory=args.dir, files=args.files)
   if args.zip_file:
-    with open(args.zip_file, 'w') as zip_file:
+    with open(args.zip_file, 'wb') as zip_file:
       zip_file.write(content)
   if args.hash_file:
-    with open(args.hash_file, 'w') as hash_file:
+    with open(args.hash_file, 'wb') as hash_file:
       hash_file.write(md5)
   if args.upload:
     UploadZip(content, md5, args.upload)