ipv6: avoid indirect calls for SOL_IP socket options

ipv6_setsockopt() can directly call ip_setsockopt()
instead of going through udp_prot.setsockopt()

ipv6_getsockopt() can directly call ip_getsockopt()
instead of going through udp_prot.getsockopt()

These indirections predate git history, not sure why they
were there.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240823140019.3727643-1-edumazet@google.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>