moveconfig: Correct ordering of asteval import

This should be after the standard imports. Move it to avoid a lot of
pylint warnings.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/moveconfig.py b/tools/moveconfig.py
index 2f7dee8..a6dbda7 100755
--- a/tools/moveconfig.py
+++ b/tools/moveconfig.py
@@ -11,7 +11,6 @@
 """
 
 from argparse import ArgumentParser
-import asteval
 import collections
 from contextlib import ExitStack
 import copy
@@ -32,6 +31,7 @@
 import time
 import unittest
 
+import asteval
 from buildman import bsettings
 from buildman import kconfiglib
 from buildman import toolchain