IB/qib: Fix typos

Change 'postion' to 'position'.

Link: https://lore.kernel.org/r/20220106082722.354680-1-qhjin.dev@gmail.com


Signed-off-by: Qinghua Jin <qhjin.dev@gmail.com>
Acked-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>