selftests/xsk: generate data for multi-buffer packets

Add the ability to generate data in the packets that are correct for
multi-buffer packets. The ethernet header should only go into the
first fragment followed by data and the others should only have
data. We also need to modify the pkt_dump function so that it knows
what fragment has an ethernet header so it can print this.

Signed-off-by: Magnus Karlsson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

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