bonding: add lp_interval attribute netlink support

Add IFLA_BOND_LP_INTERVAL to allow get/set of bonding parameter
lp_interval via netlink.

Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/bonding/bond_netlink.c
Simple merge

diff --cc drivers/net/bonding/bond_options.c
Simple merge

diff --cc drivers/net/bonding/bond_sysfs.c
Simple merge

diff --cc drivers/net/bonding/bonding.h
Simple merge

diff --cc include/uapi/linux/if_link.h
Simple merge