LU-8066 llite: move /proc/fs/lustre/llite/*_easize to sysfs

LU-8066 llite: move /proc/fs/lustre/llite/*_easize to sysfs

Move max_easize and default_easize files from /proc/fs/lustre/llite/*
to /sys/fs/lustre/llite/*/

This is a modified version of

Linux-commit: f5501d042e5dd2b9932f1cad8ad3a71ec4777926
Linux-commit: 60b65afb700626f0fe43589138c8ca9ac460d634

Change-Id: Ie445d976ba6e21a224adc1894c108a7d30ed3a8b
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/32506
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Ben Evans <bevans@cray.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>