LU-12923 mdc: Use BUILD_BUG_ON() for mdc_reint.c

This patch replaces all CLASSERT() with kernel defined
BUILD_BUG_ON() for file lustre/mdc/mdc_reint.c

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.super@gmail.com>
Change-Id: I70a711f15e6471f7a89577e4d7d712cf46e4e0cd
Reviewed-on: https://review.whamcloud.com/36717
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Petros Koutoupis <pkoutoupis@cray.com>
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: Shaun Tancheff <stancheff@cray.com>