vfs: chimera: let inode to call setStat()

in case of special files, FsInode#setStat() triggers
some actions.

Acked-by: Paul Millar
Target: master, 0.7, 0.6
(cherry picked from commit 8b534f743a1886903f9c3c2363aba781495ccfcb)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>