the files of linux-modules should be same permissions with rootfs.tar.bz2,
because it is a part of rootfs when used to install.
(From OE-Core rev: 71e141906069c6f754199512741f6e3d5b72fee7)
Signed-off-by: Li Wang <li.wang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>