staging/lustre/llite: move /proc/fs/lustre/llite/blocksize to sysfs

Move blocksize file from /proc/fs/lustre/llite/*/ to
/sys/fs/lustre/llite/*/blocksize

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>