Add bond support to rt_link.yaml. Here is an example output:

 $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/rt_link.yaml \
   --do getlink --json '{"ifname": "bond0"}' --output-json | jq '.linkinfo'
 {
   "kind": "bond",
   "data": {
     "mode": 4,
     "miimon": 100,
     ...
     "arp-interval": 0,
     "arp-ip-target": [
       "192.168.1.1",
       "192.168.1.2"
     ],
     "arp-validate": 0,
     "arp-all-targets": 0,
     "ns-ip6-target": [
       "2001::1",
       "2001::2"
     ],
     "primary-reselect": 0,
     ...
     "missed-max": 2,
     "ad-info": {
       "aggregator": 1,
       "num-ports": 1,
       "actor-key": 0,
       "partner-key": 1,
       "partner-mac": "00:00:00:00:00:00"
     }
   }
 }

And here is the downlink info.

 $ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/rt_link.yaml \
   --do getlink --json '{"ifname": "dummy0"}' --output-json | jq '.linkinfo'
 {
   "kind": "dummy",
   "slave-kind": "bond",
   "slave-data": {
     "state": 0,
     "mii-status": 0,
     "link-failure-count": 0,
     "perm-hwaddr": "f2:82:f7:cc:47:13",
     "queue-id": 0,
     "prio": 0
   }
 }
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Link: https://lore.kernel.org/r/20240409083504.3900877-1-liuhangbin@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>