fs: add do_futimesat() helper; remove internal call to sys_futimesat()

Using this helper removes the in-kernel call to the sys_futimesat()
syscall.

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/[email protected]

Cc: Alexander Viro <[email protected]>
Signed-off-by: Dominik Brodowski <[email protected]>

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