[IPV4]: Add LC-Trie FIB lookup algorithm.

Signed-off-by: Robert Olsson <Robert.Olsson@data.slu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/ipv4/Kconfig
Simple merge

diff --cc net/ipv4/Makefile
Simple merge

diff --cc net/ipv4/af_inet.c
Simple merge

diff --cc net/ipv4/fib_trie.c
Simple merge