UPSTREAM: erofs: adjust per-CPU buffers according to max_pclusterblks

Adjust per-CPU buffers on demand since big pcluster definition is
available. Also, bail out unsupported pcluster size according to
Z_EROFS_PCLUSTER_MAX_SIZE.

Link: https://lore.kernel.org/r/20210407043927.10623-7-xiang@kernel.org


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

Bug: 201372112
Change-Id: I86665be0519f328614d93aa24cb06043655576b9
(cherry picked from commit 4fea63f7)
Signed-off-by: Huang Jianan <huangjianan@oppo.com>