This function is only used in sockets, thus making it a private function
of socket library and renaming it relevantly.
Note that sockets should be reviewed at some point to avoid using such
function: zsock_received_cb() already get the ip header and the protocol
header, so it could grab the src addr/port from there. It would be way
more optimized to do so, since net_pkt_get_src_addr is costly as it
parses all over again the ip/protocol headers.
utils unit test is updated and the test of the former
net_pkt_get_src_addr/net_pkt_get_dst_addr are removed.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
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