binman: Show the size when writing entries

Update the log output to show the size, since this is useful information.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/control.py b/tools/binman/control.py
index 072417f..1952b2a 100644
--- a/tools/binman/control.py
+++ b/tools/binman/control.py
@@ -244,7 +244,8 @@
             if not os.path.exists(fname):
                 os.makedirs(fname)
             fname = os.path.join(fname, 'root')
-        tout.Notice("Write entry '%s' to '%s'" % (entry.GetPath(), fname))
+        tout.Notice("Write entry '%s' size %x to '%s'" %
+                    (entry.GetPath(), len(data), fname))
         tools.WriteFile(fname, data)
     return einfos