fsck.f2fs: allow fsck to fix issues with online resize due to SPO

fsck.f2fs: allow fsck to fix issues with online resize due to SPO

Add support for new CP flag CP_RESIZEFS_FLAG set during online
resize FS. If SPO happens after SB is updated but CP isn't, then
allow fsck to fix it.

The fsck errors without this fix -
    Info: CKPT version = 6ed7bccb
            Wrong user_block_count(2233856)
    [f2fs_do_mount:3365] Checkpoint is polluted

The subsequent mount failure without this fix -
[   11.294650] F2FS-fs (sda8): Wrong user_block_count: 2233856
[   11.300272] F2FS-fs (sda8): Failed to get valid F2FS checkpoint

Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>