Add fanotify syscalls to <asm-generic/unistd.h>.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Eric Paris <eparis@redhat.com>