Revert "netlink: add NETLINK to GENERIC."
This is a Direct commit to releng/13.2.
Requested by: re (cperciva)
Approved by: re (cperciva)
This reverts commit 6058f6cc48f5ec02476bf46693673bd71291a5c0.
This reverts commit 692e19cf519578176d51d4c1001b01b1f355c1de.