mlx5: fix xdp data_meta setup in mlx5e_fill_xdp_buff

The helper function xdp_set_data_meta_invalid() must be called after
setting xdp->data as it depends on it.

The bug was introduced in the cited patch below, and cause the kernel
to crash when using BPF helper bpf_xdp_adjust_head() on mlx5 driver.

Fixes: 39d6443c ("mlx5, xsk: Migrate to new MEM_TYPE_XSK_BUFF_POOL")
Reported-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Tested-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>