revert "config FS_JOURNAL_INFO"

[Alexey Dobriyan]

Can we please revert commit e4c570c4cb7a95dbfafa3d016d2739bf3fdfe319
"task_struct: make journal_info conditional"

I think I gave a good enough arguments to not merge it.
To iterate:
* patch makes impossible to start using ext3 on EXT3_FS=n kernels
without reboot.
* this is done only for one pointer on task_struct

None of config options which define task_struct are tristate directly
or effectively.

There are other examples where we don't do this:
* quota stuff on superblock aren't ifdeffed because of modular XFS
with quota support.
* exports operations and  s_anon for NFS
and so on
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