LU-8066 obdclass: Remove lprocfs_obd_short_io_bytes_* declarations

LU-8066 obdclass: Remove lprocfs_obd_short_io_bytes_* declarations

The functions themselves were long renamed

Change-Id: Ic97d83a56d065ff1dadfc9a01d878e246e06a847
Test-Parameters: trivial
Fixes: 32fb31f3bf ("LU-8066 osc: move suitable values from procfs to sysfs")
Signed-off-by: Oleg Drokin <green@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/45096
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>