const: mark remaining super_operations const

arch/powerpc/platforms/cell/spufs/inode.c

arch/s390/hypfs/inode.c

drivers/isdn/capi/capifs.c

drivers/misc/ibmasm/ibmasmfs.c

drivers/oprofile/oprofilefs.c

drivers/usb/core/inode.c

drivers/usb/gadget/inode.c

fs/befs/linuxvfs.c

fs/btrfs/super.c

fs/nilfs2/super.c

fs/omfs/inode.c

fs/squashfs/super.c

fs/super.c

fs/xfs/linux-2.6/xfs_super.c

ipc/mqueue.c

kernel/cgroup.c

net/socket.c

net/sunrpc/rpc_pipe.c