erofs-utils: lib: use GPL-2.0+ OR Apache-2.0 dual license

Let's release liberofs under GPL-2.0+ OR Apache-2.0 license for
better 3rd-party integration.

Link: https://lore.kernel.org/r/20211202022521.4291-1-huangjianan@oppo.com
Acked-by: Yue Hu <huyue2@yulong.com>
Acked-by: Hu Weiwen <sehuww@mail.scut.edu.cn>
Acked-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Acked-by: Guo Xuenan <guoxuenan@huawei.com>
Acked-by: Li Guifu <bluce.lee@aliyun.com>
Signed-off-by: Huang Jianan <huangjianan@oppo.com>
Signed-off-by: Gao Xiang <xiang@kernel.org>
41 files changed