net/icmpv6: Improve callback signature to pass icmp header

In nbr part, this is a useful information. Since net_icmpv6_input has
already parsed the icmpv6 header, let's get pass it, instead of
retrieving/parsing it again in various handler functions.

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