src: mnl: make family specification more strict when listing

src: mnl: make family specification more strict when listing

make "nft list hooks <family>" more strict.

nft list hooks: query/list all NFPROTO_XXX values, i.e.
arp, bridge, ipv4, ipv6.

If a device is also given, then do include the netdev family for
the given device as well.

"nft list hooks arp" will only dump the hooks registered
for NFPROTO_ARP (or nothing at all if none are active).

"bridge", "ip", "ip6" will list the pre/in/forward/output/postrouting
hooks for these families, if any.

"inet" serves as an alias for "ip" and "ip6".

Link: https://lore.kernel.org/netfilter-devel/20240729153211.GA26048@breakpoint.cc/
Signed-off-by: Florian Westphal <fw@strlen.de>