net/udp: Switch net_udp_get/set_hdr to new net_pkt API

Let's use the new API for these 2 functions. Note that in some places,
using these functions is under-optimized (like in llmnr-responder in
dns: it gets the ip/udp headers already from the recv callback. That
will need to be taken care of later).

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
2 files changed