tools/genboardscfg.py: ignore defconfigs starting with a dot

Kconfig in U-Boot creates a temporary file configs/.tmp_defconfig
during processing "make <board>_defconfig".  The temporary file
might be left over for some reasons.

Just in case, tools/genboardscfg.py should make sure to
not read such garbage files.
Signed-off-by: NMasahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: NSimon Glass <sjg@chromium.org>

tools/genboardscfg.py

@@ -411,6 +411,8 @@ def __gen_boards_cfg(jobs):
     for (dirpath, dirnames, filenames) in os.walk(CONFIG_DIR):
         dirpath = dirpath[len(CONFIG_DIR) + 1:]
         for filename in fnmatch.filter(filenames, '*_defconfig'):
+            if fnmatch.fnmatch(filename, '.*'):
+                continue
             defconfigs.append(os.path.join(dirpath, filename))
 
     # Parse all the MAINTAINERS files