Format python files.

I used yapf to apply to Google style but I had to install with pip and
invoke the library as a script so not suitable for integration yet.

Change-Id: I8c3d9c334bf1766f0fff7217270c148a3d1d7662
diff --git a/build/image/convert_to_binary.py b/build/image/convert_to_binary.py
index bf50a8e..2935ec8 100644
--- a/build/image/convert_to_binary.py
+++ b/build/image/convert_to_binary.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-
 """Convert a file to binary format.
 
 Calls objcopy to convert a file into raw binary format.
@@ -9,19 +8,19 @@
 import subprocess
 import sys
 
+
 def Main():
-  parser = argparse.ArgumentParser()
-  parser.add_argument("--tool_prefix", required=True)
-  parser.add_argument("--input", required=True)
-  parser.add_argument("--output", required=True)
-  args = parser.parse_args()
-  subprocess.check_call([
-      "{}objcopy".format(args.tool_prefix),
-      "-O",
-      "binary",
-      args.input,
-      args.output])
-  return 0
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--tool_prefix", required=True)
+    parser.add_argument("--input", required=True)
+    parser.add_argument("--output", required=True)
+    args = parser.parse_args()
+    subprocess.check_call([
+        "{}objcopy".format(args.tool_prefix), "-O", "binary", args.input,
+        args.output
+    ])
+    return 0
+
 
 if __name__ == "__main__":
-  sys.exit(Main())
+    sys.exit(Main())