xsk: Use kvcalloc to support large umems

Use kvcalloc() instead of kcalloc() to support large umems with, on my
server, one million pages or more in the umem.

Reported-by: Dan Siemon <[email protected]>
Signed-off-by: Magnus Karlsson <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Björn Töpel <[email protected]>
Acked-by: John Fastabend <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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