Merge branch 'ipv6-add-ipv6_addr_-cpu_to_be32-be32_to_cpu-helpers'

Simon Horman says:

====================
ipv6: Add ipv6_addr_{cpu_to_be32,be32_to_cpu} helpers

This series adds and uses some new helpers,
ipv6_addr_{cpu_to_be32,be32_to_cpu}, which are intended to assist in
byte order manipulation of IPv6 addresses stored as as arrays.

v1: https://lore.kernel.org/r/20240812-ipv6_addr-helpers-v1-0-aab5d1f35c40@kernel.org
====================

Link: https://patch.msgid.link/20240813-ipv6_addr-helpers-v2-0-5c974f8cca3e@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>