wic: Include mount point into image report

Wic doesn't show any information for the partition if label is not set.
Fixed this by adding mount point to the report.

(From OE-Core rev: 36be9c1f7a6fded146a6f1c268455d826d78f97b)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/imager/direct.py

@@ -351,7 +351,7 @@ class DirectImageCreator(BaseImageCreator):
             if p.mountpoint == '/':
                 str = ':'
             else:
-                str = '["%s"]:' % p.label
+                str = '["%s"]:' % (p.mountpoint or p.label)
             msg += '  ROOTFS_DIR%s%s\n' % (str.ljust(20), p.get_rootfs())
 
         msg += '  BOOTIMG_DIR:                  %s\n' % self.bootimg_dir