configure: Check if we can use ibv_reg_mr_iova

The function reg_mr_iova is an enhanced version of ibv_reg_mr function
that can help to easly register and use guest's MRs.

Add check in 'configure' phase to detect if we have libibverbs with this
support.

Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Message-Id: <20190818132107.18181-2-yuval.shaia@oracle.com>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>