f2fs: make compressed files compatible with large folio

The compression flag is the hint indicates that the inode can be
compressed, when the inode is using large folio, we expected it keeps
using the large folio read/write paths and its data stays uncompressed
on disk until the inode is evicted and re-read

Let f2fs_write_begin() skip the compression overwrite preparation for
such inodes and remove the compressed-file gate in
f2fs_read_data_large_folio() so the data is simply read/written as
regular blocks.

For the same reason, reject F2FS_IOC_COMPRESS_FILE with -EOPNOTSUPP
once the inode mapping is switched to large folios.

Signed-off-by: Nanzhe Zhao <zhaonanzhe@xiaomi.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>