binman: Add support for outputing a map file

It is useful to be able to see a list of regions in each image produced by
binman. Add a -m option to output this information in a '.map' file
alongside the image file.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/cmdline.py

@@ -30,6 +30,8 @@ def ParseArgs(argv):
             help='Add a path to a directory to use for input files')
     parser.add_option('-H', '--full-help', action='store_true',
         default=False, help='Display the README file')
+    parser.add_option('-m', '--map', action='store_true',
+        default=False, help='Output a map file for each image')
     parser.add_option('-O', '--outdir', type='string',
         action='store', help='Path to directory to use for intermediate and '
         'output files')