net, xdp: Introduce xdp_init_buff utility routine

Introduce xdp_init_buff utility routine to initialize xdp_buff fields
const over NAPI iterations (e.g. frame_sz or rxq pointer). Rely on
xdp_init_buff in all XDP capable drivers.

Signed-off-by: Lorenzo Bianconi <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Reviewed-by: Alexander Duyck <[email protected]>
Acked-by: Jesper Dangaard Brouer <[email protected]>
Acked-by: John Fastabend <[email protected]>
Acked-by: Shay Agroskin <[email protected]>
Acked-by: Martin Habets <[email protected]>
Acked-by: Camelia Groza <[email protected]>
Acked-by: Marcin Wojtas <[email protected]>
Link: https://lore.kernel.org/bpf/7f8329b6da1434dc2b05a77f2e800b29628a8913.1608670965.git.lorenzo@kernel.org
Signed-off-by: Alexei Starovoitov <[email protected]>

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