mlx5_core: Adjust hca_cap.uar_page_sz to conform to Connect-IB spec

mlx5_core: Adjust hca_cap.uar_page_sz to conform to Connect-IB spec

Sparse reported an endianness bug in the assignment to hca_cap.uar_page_sz.

Fix the declaration of this field to be __be16 (which is what is in
the firmware spec), renaming the field to log_uar_pg_size to conform
to the spec, which fixes the endianness bug reported by sparse.

Reported-by: Fengguang Wu <[email protected]>
Signed-off-by: Moshe Lazer <[email protected]>
Signed-off-by: Or Gerlitz <[email protected]>
Signed-off-by: Roland Dreier <[email protected]>