Merge branch 'ipv4-consolidate-route-lookups-from-ipv4-sockets'

Guillaume Nault says:

====================
ipv4: Consolidate route lookups from IPv4 sockets.

Create inet_sk_init_flowi4() so that the different IPv4 code paths that
need to do a route lookup based on an IPv4 socket don't need to
reimplement that logic.
====================

Link: https://patch.msgid.link/cover.1734357769.git.gnault@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>