netlink: Pre-register the missing devctl event systems

[christos]

Summary

devctl_notify() can be called with a mutex held. If the event system is
not listed in devctl_systems[], sysevent_get_group() calls
sysevent_new_group(), which calls strdup() with M_WAITOK, and we may end
up sleeping while holding a non-sleepable mutex.

Add the missing systems.

PR: 299272
MFC after: 1 week
Sponsored by: The FreeBSD Foundation

[emaste]

sys/netlink/netlink_sysevent.c

70–71

this seems odd, should we switch the inconsistent ones over? or do case-insensitive match?

[christos]

sys/netlink/netlink_sysevent.c

70–71

The odd one is probably "KERNEL" because it not used anywhere in the kernel IIRC.

[imp]

sys/netlink/netlink_sysevent.c

70–71

I think I switched all the KERNEL to kernel, but overlooked this.
It should match the list we have in the devd.conf(5) man page I think.

[christos]

Remove "KERNEL".