netlink: specs: add OVS packet family specification

Add YAML netlink spec for the OVS_PACKET_FAMILY (ovs_packet).
This completes the set of OVS genetlink family specs (ovs_datapath,
ovs_flow, ovs_vport already exist).

The spec defines three operations: MISS (event), ACTION (event),
and EXECUTE (do). MISS and ACTION are kernel-to-userspace upcalls
sent via genlmsg_unicast(); EXECUTE is the only registered genl
operation.

Key, actions, and egress-tun-key attributes are typed as binary
rather than nest because the nested attribute definitions belong
to the ovs_flow spec and cross-spec references are not supported
by the YNL framework.

Signed-off-by: Minxi Hou <houminxi@gmail.com>
Link: https://patch.msgid.link/20260522174154.720293-2-houminxi@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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