Consistently use endian.h swapping API

Consistently use endian.h swapping API

A handful of places are still using the old "networking" API. Swap that
with the usual (no longer GNU/glibc specific) ntobe*/be*toh.

Be that to stay consistent, to improve clarity or to celebrate that the
later is part of POSIX (2024) - take your pick.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Lucas De Marchi <demarchi@kernel.org>
Link: https://github.com/kmod-project/kmod/pull/421
Signed-off-by: Lucas De Marchi <demarchi@kernel.org>