netlink: specs: rt-route: describe lwtunnel IP options

Replace binary opts in lwtunnel-ip and lwtunnel-ip6 with a nested
lwtunnel-ip-opts set. Add attribute sets for geneve, vxlan, and erspan
IP options to match linux/lwtunnel.h.

Note the kernel encodes LWTUNNEL_IP_OPTS_GENEVE differently for requests
vs dumps. On the request path, the kernel iterates and reads one
CLASS/TYPE/DATA triplet per geneve option. On the dump path, the kernel
opens only one nested geneve option and writes a CLASS/TYPE/DATA triplet
for every option within it. Before there is a proper way to handle it,
I will just omit geneve options and use binary for it.

Signed-off-by: Hangbin Liu <liuhangbin@kylinos.cn>
Link: https://patch.msgid.link/20261008-ynl_rt_encap-v4-4-4ed2ccf7f949@kylinos.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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