IB/qib: Remove double define

Signed-off-by: Edwin van Vliet <edwin@cheatah.nl>
Reviewed-by: Jesper Juhl <jj@chaosbits.net>
Acked-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>