binman: Correct path for fip_util

This should be imported from the binman module. Fix it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/fip_util_test.py b/tools/binman/fip_util_test.py
index 4839b29..06827f5 100755
--- a/tools/binman/fip_util_test.py
+++ b/tools/binman/fip_util_test.py
@@ -22,7 +22,7 @@
 # pylint: disable=C0413
 from patman import test_util
 from patman import tools
-import fip_util
+from binman import fip_util
 
 HAVE_FIPTOOL = True
 try: