net/mlx5e: Fix a typo in mlx5e_xdp_mpwqe_is_full

Fix a typo in the function name: mpqwe -> mpwqe (stands for multi-packet
work queue element).

Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>