LU-13761 o2ib: Fix compilation with MOFED 5.1

LU-13761 o2ib: Fix compilation with MOFED 5.1

A new argument was added to rdma_reject() in MOFED 5.1 and
Linux 5.8.

Add a cofigure check and support both versions of rdma_reject().

Lustre-commit: 956deb0fe8195c7a0c38c66a5a8cc1e95c2c245e
Lustre-change: https://review.whamcloud.com/39323

Test-Parameters: trivial
Signed-off-by: Sergey Gorenko <sergeygo@mellanox.com>
Change-Id: I2b28991f335658b651b21a09899b7b17ab2a9d57
Reviewed-on: https://review.whamcloud.com/39781
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>