make_image_bootable: pass 3 args to mount_image

bin/cros_make_image_bootable: make_image_bootable should pass only
3 args to the mount_image func

BUG=None
TEST=existing unit tests

Change-Id: Ie24146db3cc8371414c383b16acb3c00a629a6f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2707403
Tested-by: Sergey Frolov <sfrolov@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
1 file changed