UPSTREAM: erofs: enable big pcluster feature

Enable COMPR_CFGS and BIG_PCLUSTER since the implementations are
all settled properly.

Link: https://lore.kernel.org/r/20210407043927.10623-11-xiang@kernel.org


Acked-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>

Bug: 201372112
Change-Id: I85a9045c146b6877eb371904e82d0481e21bbb75
(cherry picked from commit 8e6c8fa9)
Signed-off-by: Huang Jianan <huangjianan@oppo.com>