Revert "f2fs: fix to tag gcing flag on page during block migration"

This reverts commit 7ea0f29d.

[  146.693904][ T8878] WARNING: CPU: 2 PID: 8878 at fs/f2fs/segment.c:3335 f2fs_allocate_data_block+0x130/0xd08

panic in:

f2fs_write_data_pages
 -> f2fs_write_multi_pages
  -> f2fs_write_single_data_page
   -> f2fs_do_write_data_page
    -> f2fs_outplace_write_data
     -> do_write_page
      -> f2fs_allocate_data_block

 if (from_gc) {
         f2fs_bug_on(sbi, GET_SEGNO(sbi, old_blkaddr) == NULL_SEGNO);
         se = get_seg_entry(sbi, GET_SEGNO(sbi, old_blkaddr));
         sanity_check_seg_type(sbi, se->type);
         f2fs_bug_on(sbi, IS_NODESEG(se->type));
 }

Bug: 345273844
Change-Id: I62732bbcb37a7864588886b862b590a463b4d1d9
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>