net/mlx5e: Use u8 as ownership type in mlx5e_get_cqe()

CQE ownership indication is as small as a single bit.
Use u8 to speedup the comparison.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Cc: kernel-team@fb.com
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>