BACKPORT: FROMGIT: erofs: enable sub-page compressed block support

Let's just disable cached decompression and inplace I/Os for partial
pages as the first step in order to enable sub-page block initial
support.  In other words, currently it works primarily based on
temporary short-lived pages.  Don't expect too much in terms of
performance.

Reviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20231206091057.87027-6-hsiangkao@linux.alibaba.com

Bug: 318378021
Change-Id: I00238aa437f20c46d015bbe5ab7b706b80b8cfd7
(cherry picked from commit 0ee3a0d5
 https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git

 dev)
[dhavale: resolved conflicts in inode.c in erofs_fill_inode()]
Signed-off-by: Sandeep Dhavale <dhavale@google.com>