erofs-utils: lib: support fragments

Add fragments support for erofsfuse.

Also, this keeps in sync with the latest kernel
commit b15b2e307c3a ("erofs: support on-disk compressed fragments data")

Signed-off-by: Yue Hu <huyue2@coolpad.com>
Link: https://lore.kernel.org/r/20220930130842.6728-1-zbestahu@163.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
5 files changed