RDMA/qedr: Fix use of uninitialized field

dev->attr.page_size_caps was used uninitialized when setting device
attributes

Fixes: ec72fce4 ("qedr: Add support for RoCE HW init")
Link: https://lore.kernel.org/r/20200902165741.8355-4-michal.kalderon@marvell.com


Signed-off-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>