fs: move inode sysctls to its own file

Patch series "sysctl: 4th set of kernel/sysctl cleanups".

This is slimming down the fs uses of kernel/sysctl.c to the point that
the next step is to just get rid of the fs base directory for it and
move that elsehwere, so that next patch series starts dealing with that
to demo how we can end up cleaning up a full base directory from
kernel/sysctl.c, one at a time.

This patch (of 9):

kernel/sysctl.c is a kitchen sink where everyone leaves their dirty
dishes, this makes it very difficult to maintain.

To help with this maintenance let's start by moving sysctls to places
where they actually belong.  The proc sysctl maintainers do not want to
know what sysctl knobs you wish to add for your own piece of code, we
just care about the core logic.

So move the inode sysctls to its own file.  Since we are no longer using
this outside of fs/ remove the extern declaration of its respective proc
helper.

We use early_initcall() as it is the earliest we can use.

[[email protected]: avoid unused-variable warning]
  Link: https://lkml.kernel.org/r/[email protected]

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Luis Chamberlain <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Iurii Zaikin <[email protected]>
Cc: Xiaoming Ni <[email protected]>
Cc: Eric Biederman <[email protected]>
Cc: Stephen Kitt <[email protected]>
Cc: Lukas Middendorf <[email protected]>
Cc: Antti Palosaari <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Jeff Layton <[email protected]>
Cc: "J. Bruce Fields" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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