dynset: avoid errouneous assert with ipv6 concat dataHEADmaster

nft add rule ip6 table-test chain-1 update @map-X { ip6 saddr : 1000::1 . 5001 }
nft: src/netlink_linearize.c:873: netlink_gen_expr: Assertion `dreg < ctx->reg_low' failed.
Aborted (core dumped)

This is because we pass the EXPR_SET_ELEM expr to the register allocation,
which will make it reserve 1 128 bit register / 16 bytes.

This happens to be enough for most cases, but its not for ipv6 concat data.
Pass the actual key and data instead: This will reserve enough space to
hold a possible concat expression.

Also add test cases.

Signed-off-by: Son Dinh <dinhtrason@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>

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