Merge branch 'ipv4-prepare-bpf-helpers-to-flowi4_tos-conversion'

Guillaume Nault says:

====================
ipv4: Prepare bpf helpers to .flowi4_tos conversion.

Continue the process of making a dscp_t variable available when setting
.flowi4_tos. This series focuses on the BPF helpers that initialise a
struct flowi4 manually.

The objective is to eventually convert .flowi4_tos to dscp_t, (to get
type annotation and prevent ECN bits from interfering with DSCP).
====================

Link: https://patch.msgid.link/cover.1731064982.git.gnault@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>