net/mlx5e: Use kzalloc() in mlx5e_accel_fs_tcp_create()

'accel_tcp' is allocted by kvzalloc() now, which is a small chunk.
Use kzalloc() directly instead of kvzalloc().

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>